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Regent + Plus

PD 7901

Industrial Control Services

I/O Termination Assembly (ITA)

RH/LH Varelco Connector and Screw

Terminal Versions

(T7901, T7902 and T7903)

Issue 1,

March, 06

I/O Termination Assemblies (ITAs) are used in conjunction with I/O

modules to enhance the field wiring philosophy of the Regent + Plus

product range. The ITAs provide connector type conversion, analog

conversion, panel break facilities and an ideal point for test signal

injection. The ITAs can provide these facilities for all I/O modules with

the exception of the Thermocouple, RTU, Relay and Isolated Guarded

Output modules, which are wired in a conventional manner.

Features

Rapid connection between I/O chassis and customer field

devices

Optional current to voltage convers

ion for active field devices

Provides supply and return paths for field devices

Right

hand Varelco version

T7901

Left

hand Varelco version

T7902

Screw terminal version (high voltage)

T7903

Provides panel break facilities

Uses standard cables

Fault tolerant configurable

The ITAs provide rapid connection between I/O chassis and customer

field wiring, using pre

formed cables which are wired on a one to one

basis (ie. module pin 1 to ITA pin 1). A common supply path is

provided, allowing common field/ret

urn and analog conversion via

resistors.

Summary of content (60 pages)

PAGE 1
Regent + Plus PD 7901 I/O Termination Assembly (ITA) RH/LH Varelco Connector and Screw Terminal Versions (T7901, T7902 and T7903) Issue 1, March, 06 I/O Termination Assemblies (ITAs) are used in conjunction with I/O modules to enhance the field wiring philosophy of the Regent + Plus product range. The ITAs provide connector type conversion, analog conversion, panel break facilities and an ideal point for test signal injection.
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I/O Termination Assembly A Varelco version has been developed for low voltage applications and a screw terminal version for low and high voltage applications. Both types of ITA are TÜV Certified. Only one ITA is required per redundant slice. There are three types of ITA: · Varelco Connector Right Hand (Product Group T7901). Provides connection for low voltage right hand cable entry terminations. A typical example is shown below: · Varelco Connector Left Hand (Product Group T7902).
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I/O Termination Assembly · Screw Terminal (Product Group T7903). Provides screw terminal connection for low and high voltage applications.
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I/O Termination Assembly The unused pins of the connector are tracked to a screw terminal on the PCB to allow the field cables and hoods to be grounded if required. Module Operation As shown below, pre-formed polarised I/O cables are connected between the I/O backplanes and ITA connectors J1/J2/J3/J4/J6/J7/J8/J9. Field cables are connected to J5 and common feed/returns and spare pin grounds are applied to connector J10 (screw terminals).
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I/O Termination Assembly Application Table 1 shows the ITA type/variant to be used with each type of Regent + Plus I/O module.
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I/O Termination Assembly Table 1 (continued) - Module / ITA Type Module ITA Produc t No - - Single Ended, No Current Limiting Field Loop Comments Refer to Appendix B T7444 790311 T7401 790111 790211 T7402 790111 790211 T7408 790311 Screw Terminal Only T7404 790311 Screw Terminal Only T7441A 790111 790211 T7420A 790111 790211 T7420AF 790111 790211 - - T7401 790112 790212 T7402 790112 790212 T7441 790112 790212 - 6 ITA Type - T7420A 790113 790213 T7420AF 790113 790213
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I/O Termination Assembly Table 1 (continued) - Module / ITA Type Module ITA Produc t No - - ITA Type Single Ended, External Current Limiting Comments Refer to Appendix E T7411 790114 790214 T7411F 790114 790214 T7418F 790314 T7401 790114 790214 T7402 790114 790214 T7408 790314 Screw Terminal only T7404 790314 Screw Terminal only T7420A 790114 790214 T7420AF 790114 790214 - - T7420A 790115 790215 T7420AF 790115 790215 - - Screw Terminal only Differential Analog Current
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I/O Termination Assembly Specifications Electrical Specification Power Supply Requirements: Dependent on I/O variant. Maximum values are given for reference.
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I/O Termination Assembly Appendix A - Differential, Field Loop YTMR790110 (Right Hand Varelco Connector) YTMR790210 (Left Hand Varelco Connector) YTMR790310 (Screw Terminal Connector) The Differential, Field Loop, ITA provides the facility to connect sixteen differential field circuits to the I/O modules. One Differential, Field Loop, ITA is capable of feeding two modules, as shown in the block diagrams below: Figure A-1.
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I/O Termination Assembly The modules which use the Differential Field Loop ITA are listed in Table 1 of the main document. These modules function in a manner such that the field devices do not require a common feed or return, as illustrated below: The connector idents are shown on the legend on the ITA.
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I/O Termination Assembly The four 8-Way connectors are tracked to the connectors. as shown in Tables A-1 and A-2. Table A-1. P D -7901 M a r c h , 0 6 Varelco Connections.
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I/O Termination Assembly J9 S6 JJ J9 S7 MM J9 S8 NN J10 GND U, V, W, X, SS, TT Table A-2. 12 Screw Terminal Connections.
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I/O Termination Assembly P D -7901 M a r c h , 0 6 J9 S3 21 J9 S4 22 J9 S5 25 J9 S6 26 J9 S7 29 J9 S8 30 13
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I/O Termination Assembly A set of five screw terminals on the Varelco variant of the ITA provides the facility to ground the spare Varelco pins and for the reference analog voltage to be connected to the I/O module (this facility specifically concerns the T7420 Analog Input Module when it is used with differential voltage input wiring). The detailed connections are listed in Table A-3. Table A-3. 14 Varelco J10 Connection Details.
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I/O Termination Assembly A set of four screw terminals on the Screw Terminal variant of the ITA provides the facility for the reference voltage to be passed to the T7420 Analog Input Module. A circuit schematic is shown below and the detailed connections are listed in Table A-4. Table A-4. P D -7901 M a r c h , 0 6 Screw Terminal J10 Connection Details. Connector Ident Pin Ident Comments J10 A Connect to AREF1/AREF2. (T7420 only) J10 B Connect to AGND.
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I/O Termination Assembly A p p e n d i x B - Single Ended, No Current Limiting, Field Loop YTMR790111 (Right Hand Varelco Connector) YTMR790211 (Left Hand Varelco Connector) YTMR790311 (Screw Terminal Connector) The Single Ended, No Current Limiting, Field Loop ITA provides a method for supplying a common feed/return path to field devices on a per module basis, as shown below: The single ended signal is fed from the I/O chassis to the ITA.
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I/O Termination Assembly Figure B-1. Varelco Left Hand Single Ended, No Current Limiting, Field Loop, Block Diagram. The modules which use the Single Ended, No Current Limiting Field Loop ITA are listed in Table 1 of the main document. The two 8-Way connectors are tracked to the connectors. as shown in Tables B-1 and B-2.
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I/O Termination Assembly Table B-1. 18 Varelco Connections.
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I/O Termination Assembly J8 S8 PP J10 A RR J10 GND U, V, W, X, SS, TT Table B-2. P D -7901 M a r c h , 0 6 Screw Terminal Connections.
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I/O Termination Assembly J8 S6 27 J10 A 28 J8 S7 29 J10 A 30 J8 S8 31 J10 A 32 A set of five screw terminals on the Varelco variant of the ITA provides the facility to connect the common feed/return supply, ground spare Varelco pins and connecting the reference voltage of analog I/O modules (T7420) when using single ended wiring. The detailed connections are listed in Table B-3. Table B-3. Varelco J10 Connection Details.
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I/O Termination Assembly Table B-4. P D -7901 M a r c h , 0 6 Screw Terminal J10 Connection Details. Connector Ident Pin Ident Comments J10 A Connect common feed/return supply. J10 B Connect to AGND (T7420 only) . J10 C Connect AREF1 & AREF2 (T7420 only). J10 D Cable Screen and GND.
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I/O Termination Assembly A p p e n d i x C - Single Ended, Current Limiting, Field Loop With Dioded Power Protection (24V) YTMR790112 (Right Hand Varelco Connector) YTMR790212 (Left Hand Varelco Connector) YTMR790312 (Screw Terminal Connector) The Single Ended, Current Limiting, Field Loop ITA provides the facility to provide a method for supplying a common feed/return path to field devices on a per module basis, as shown below. The ITA has a 2k2, 5%, 1.6W resistor in the common feed/return path.
PAGE 23
I/O Termination Assembly Figure C-1. Varelco Left Hand Single Ended, Current Limiting, Field Loop With Dioded Power Protection, Block Diagram. The modules which use the Single Ended, Current Limiting Field Loop ITA are listed in Table 1 of the main document. The two 8-Way connectors are tracked to the connectors. as shown in Tables C-1 and C-2.
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I/O Termination Assembly Table C-1. 24 Varelco Connections.
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I/O Termination Assembly J8 S8 PP J10 A RR J10 GND U, V, W, SS, TT Table C-2. P D -7901 M a r c h , 0 6 Screw Terminal Connections.
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I/O Termination Assembly J8 S6 27 J10 A 28 J8 S7 29 J10 A 30 J8 S8 31 J10 A 32 A set of five screw terminals on the Varelco variant of the ITA provides the facility to connect the common feed/ return supply and ground spare Varelco pins. The detailed connections are listed in Table C-3. Table C-3. Varelco J10 Connection Details. Connector Ident Pin Ident Comments J10 A Connect common feed/return supply. J10 B Power 1 In. J10 C Power 2 In. J10 D Power 3 In.
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I/O Termination Assembly Table C-4. P D -7901 M a r c h , 0 6 Screw Terminal J10 Connection Details. Connector Ident Pin Ident Comments J10 A Connect common feed/return supply. J10 B Power 1 in. J10 C Power 2 in. J10 D Power 3 in.
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I/O Termination Assembly A p p e n d i x D - Single Ended, Analog, Current Mode YTMR790113 (Right Hand Varelco Connector) YTMR790213 (Left Hand Varelco Connector) YTMR790313 (Screw Terminal Connector) The Single Ended, Analog, Current Mode ITA is used only in conjunction with the T7420 Analog Input Module when it is employing a single ended current input wiring philosophy. The ITA provides the facility for the current conversion required. The ITA is capable of handling 16 single ended signals.
PAGE 29
I/O Termination Assembly The two 8-Way connectors are tracked to the connectors. as shown in Tables D-1 and D-2. Table D-1. P D -7901 M a r c h , 0 6 Varelco Connections.
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I/O Termination Assembly J6 S7 NN J8 S8 PP J6 S8 RR J10 GND TT, V, W, X, SS, FT Table D-2. 30 Screw Terminal Connections.
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I/O Termination Assembly P D -7901 M a r c h , 0 6 J8 S6 27 J6 S6 28 J8 S7 29 J6 S7 30 J8 S8 31 J6 S8 32 31
PAGE 32
I/O Termination Assembly A set of five screw terminals on the Varelco variant of the ITA provides the facility to connect the negative supply, AGND, AREF and to ground the spare Varelco pins.. The detailed connections are listed in Table D-3. Table D-3. 32 Varelco J10 Connection Details. Connector Ident Pin Ident Comments J10 A Connect to AREF1/AREF2. J10 B Connect AGND. J10 C Connect to Field Power Supply Return. J10 D No Connection. J10 GND No Connection.
PAGE 33
I/O Termination Assembly Table D-4. P D -7901 M a r c h , 0 6 Screw Terminal J10 Connection Details. Connector Ident Pin Ident Comments J10 A Connect to AREF1/AREF2. J10 B Connect AGND. J10 C Connect to Field Power Supply Return. J10 D Cable Screen and GND.
PAGE 34
I/O Termination Assembly A p p e n d i x E - Single Ended, External Current Limiting YTMR790114 (Right Hand Varelco Connector) YTMR790214 (Left Hand Varelco Connector) YTMR790314 (Screw Terminal Connector) The Single Ended, External Current Limiting ITA provides the facility for fusing each path of the field loop when using single ended modules. The ITA is capable of handling 16 single ended signals. Each field circuit has a maximum current rating of 2A.
PAGE 35
I/O Termination Assembly The four 8-Way connectors are tracked to the connectors. as shown in Tables E-1 and E-2. Table E-1. P D -7901 M a r c h , 0 6 Varelco Connections.
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I/O Termination Assembly 36 J7 S7 NN J9 S8 PP J7 S8 RR J10 GND U, V, W, X, SS, TT Industrial Control Services
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I/O Termination Assembly Table E-2. P D -7901 M a r c h , 0 6 Screw Terminal Connections.
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I/O Termination Assembly J6 38 S8 32 Industrial Control Services
PAGE 39
I/O Termination Assembly A set of five screw terminals on the Varelco variant of the ITA provides the facility to connect to ground the spare Varelco pins. This ITA can be used with T7420 when using differential voltage input wiring. The detailed connections are listed in Table E-3. Table E-3. P D -7901 M a r c h , 0 6 Varelco J10 Connection Details. Connector Ident Pin Ident Comments J10 A Connect AREF1 and AREF2. J10 B Connect AGND (T7420). J10 C Connect Fused Common Return (T7420).
PAGE 40
I/O Termination Assembly Table E-4. 40 Screw Terminal J10 Connection Details. Connector Ident Pin Ident Comments J10 A Connect AREF1 and AREF2. J10 B AGND (T7420). J10 C Connect Fused Common Return J10 D Cable Screen and GND.
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I/O Termination Assembly Appendix F Mode Differential, Analog Current YTMR790115 (Right Hand Varelco Connector) YTMR790215 (Left Hand Varelco Connector) YTMR790315 (Screw Terminal Connector) The Differential, Analog Current Mode, ITA provides the facility to connect sixteen differential field circuits to the I/O modules. One Differential, Field Loop, ITA is capable of feeding two modules, as shown in the block diagrams below: Figure F-1.
PAGE 42
I/O Termination Assembly This ITA is used with the T7420 modules when in Differential Current Mode. The modules function in a manner such that the field devices require a 250 ohm resistor across its path, as illustrated below: The connector idents are shown on the legend on the ITA.
PAGE 43
I/O Termination Assembly The four 8-Way connectors are tracked to the connectors. as shown in Tables F-1 and F-2. Table F-1. P D -7901 M a r c h , 0 6 Varelco Connections.
PAGE 44
I/O Termination Assembly J9 S6 JJ J9 S7 MM J9 S8 NN J10 GND U, V, W, X, SS, TT Table F-2. 44 Screw Terminal Connections.
PAGE 45
I/O Termination Assembly P D -7901 M a r c h , 0 6 J9 S3 21 J9 S4 22 J9 S5 25 J9 S6 26 J9 S7 29 J9 S8 30 45
PAGE 46
I/O Termination Assembly A set of five screw terminals on the Varelco variant of the ITA provides the facility to ground the spare Varelco pins and for the reference analog voltage to be connected to the I/O module. The detailed connections are listed in Table F-3. Table F-3. 46 Varelco J10 Connection Details. Connector Ident Pin Ident Comments J10 A Connect to module AREF1 & AREF2. J10 B Connect to AGND (T7420 only). J10 C Link to Field Supply Return. J10 D No Connection.
PAGE 47
I/O Termination Assembly A set of four screw terminals on the Screw Terminal variant of the ITA provides the facility for the reference voltage to be passed to the T7420 Analog Input Module. A circuit schematic is shown below and the detailed connections are listed in Table F-4. Table F-4. P D -7901 M a r c h , 0 6 Screw Terminal J10 Connection Details. Connector Ident Pin Ident Comments J10 A Connect to AREF1 & 2. J10 B Connect to AGND. J10 C Connect to Field Supply Return.
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I/O Termination Assembly A p p e n d i x G - Differential, Field Loop With Dioded Power Protection YTMR790116 (Right Hand Varelco Connector) YTMR790216 (Left Hand Varelco Connector) YTMR790316 (Screw Terminal Connector) The Differential, Field Loop with Dioded Power Protection, ITA provides the facility to connect sixteen differential field circuits to the I/O modules. One Differential, Field Loop, ITA is capable of feeding two modules, as shown in the block diagrams below: Figure G-1.
PAGE 49
I/O Termination Assembly The modules which use the Differential Field Loop with Dioded Power Protection ITA are listed in Table 1 of the main document. These modules function in a manner such that the field devices do not require a common feed or return, as illustrated below: The connector idents are shown on the legend on the ITA.
PAGE 50
I/O Termination Assembly The four 8-Way connectors are tracked to the connectors. as shown in Tables G-1 and G-2. Table G-1. 50 Varelco Connections.
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I/O Termination Assembly J9 S6 JJ J9 S7 MM J9 S8 NN J10 GND U, V, W, X, SS, TT Table G-2. P D -7901 M a r c h , 0 6 Screw Terminal Connections.
PAGE 52
I/O Termination Assembly 52 J9 S3 21 J9 S4 22 J9 S5 25 J9 S6 26 J9 S7 29 J9 S8 30 Industrial Control Services
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I/O Termination Assembly A set of five screw terminals on the Varelco variant of the ITA provides the facility to ground the spare Varelco pins. The detailed connections are listed in Table G-3. Table G-3. P D -7901 M a r c h , 0 6 Varelco J10 Connection Details. Connector Ident Pin Ident Comments J10 A Diode Protected Power Out.
PAGE 54
I/O Termination Assembly A set of four screw terminals on the Screw Terminal variant of the ITA provides the facility for the reference voltage to be passed to the T7420 Analog Input Module. A circuit schematic is shown below and the detailed connections are listed in Table G-4. The maximum protected current is 2.5A total, with any configuration of redundant supply. Table G-4. 54 Screw Terminal J10 Connection Details. Connector Ident Pin Ident Comments J10 A Diode Protected Power Out.
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I/O Termination Assembly Appendix H - Single Ended, No Current Limiting, Field Loop With Dioded Power Protection YTMR790117 (Right Hand Varelco Connector) YTMR790217 (Left Hand Varelco Connector) YTMR790317 (Screw Terminal Connector) The Single Ended, No Current Limiting, Field Loop With Dioded Power Protection ITA provides a method for supplying a common feed/return path to field devices on a per module basis, as shown below: The single ended signal is fed from the I/O chassis to the ITA.
PAGE 56
I/O Termination Assembly Figure H-1. Varelco Left Hand Single Ended, No Current Limiting, Field Loop With Dioded Power Protection, Block Diagram. The modules which use the Single Ended, No Current Limiting Field Loop With Dioded Power Protection ITA are listed in Table 1 of the main document. The two 8-Way connectors are tracked to the connectors. as shown in Tables H-1 and H-2.
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I/O Termination Assembly Table H-1. P D -7901 M a r c h , 0 6 Varelco Connections.
PAGE 58
I/O Termination Assembly J8 S8 PP J11 A RR J10 GND U, V, W, X, SS, TT Table H-2. 58 Screw Terminal Connections.
PAGE 59
I/O Termination Assembly J8 S6 27 J11 A 28 J8 S7 29 J11 A 30 J8 S8 31 J11 A 32 A set of five screw terminals on the Varelco variant of the ITA provides the facility to connect the common feed/ return supply and ground spare Varelco pins. The detailed connections are listed in Table H-3. Table H-3. Varelco J10 Connection Details. Connector Ident Pin Ident Comments J10 A Power In/Out J10 B Power 1 In J10 C Power 2 In J10 D Power 3 In J10 GND Connect to ground.
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I/O Termination Assembly Table H-4. 60 Screw Terminal J10 Connection Details. Connector Ident Pin Ident Comments J10 A Power In/Out. J10 B Power 1 in . J10 C Power 2 in. J10 D Power 3 in.