Rockwell Automation T7903 User Manual

Regent + Plus

PD 7901

I/O Termination Assembly (ITA)

RH/LH Varelco Connector and Screw

Terminal Versions

(T7901, T7902 and T7903)

Issue 1,

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.

March, 06

Features

·

Rapid connection between I/O chassis and customer field
devices

· Optional current to voltage convers

· 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
resistors.

ion for active field devices

urn and analog conversion via

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1

I/O T

ermination 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). Provides
connection for low voltage left hand cable entry terminations. A
typical example is shown below:

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I/O Termination Assembly

· Screw Terminal (Product Group T7903). Provides screw terminal

connection for low and high voltage applications. A typical example
is shown below:

Each of the above has build variants to match the mode of operation of
the individual Regent + Plus I/O modules:

· Differential, Field Loop

· Differential, Field Loop with Dioded Power Protection

· Single Ended, with No Current Limiting in Field Loop

· Single Ended, with No Current Limiting in Field Loop with Dioded

Power Protection

· Single Ended, with Current Limiting in Field Loop with Dioded

Power Protection

· Single Ended, Analog, Current Mode

· Differential, Analog, Current Mode

· Single Ended, with External Current Limiting (Floating Earth

Systems)

Please refer to the Appendices for details of each build variant.
The ITAs are a standard size (170mm x 110mm) enabling a set area

in the back of each panel to be allocated for ITA placement. ITAs can
be grouped in order of voltage, ITA type, field zone, etc.

PD-7901

March, 06

The ITAs are packaged in a DIN Rail mounting PCB Carrier to provide
rapid assembly.

The Varelco versions of the ITAs have space allowance for a 90-Way
hood to be used on the mounting half of the field marshaling cable.

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I/O T

ermination 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
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). With a Screw Terminal ITA, connector J5
would consist of a set of dual row screw terminals.

are connected

4

Pins 1 to 8 of the I/O Chassis 8-way connectors are wired one-to-one
with pins 1 to 8 of the 8-way connectors on the ITA. Each connector
on the ITA has pin identification shown on the l
Cross-mapping between the 8-way connectors on the ITA and the
Varelco/Screw terminals is shown in the appendices. Where field
sensor power is provided on single ended ITAs, the tables in the
appendices show the field power connections and distribution.

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egend of the ITA.

I/O Termination Assembly

Module

ITA

Produc

t No

ITA Type

Comments

- -

Differential Field Loop

Refer to Appendix A
T7454
T7461A

T7

462A

T7468A
T7470

T7480

T7420A

T7420AF

790310

790110

790210

790110

790210

790310

790310

790110

790210

790110

790210

790110

790210

790110

790210

Screw Terminal Only

For voltages below

48Vdc

For voltages above 48V

dc

Screw Terminal Only

Differential Voltage Mode

Differential Voltage Mode

- -

Single Ended, No Current
Limiting Field Loop

Refer to Appendix B

T7464
T7481
T7484
T7488
T7411F

T7411

T7418F

790311

790111

790311

790311

790111

790211

790111

790211

790311

Screw Termin

al Only

Screw Terminal Only

Screw Terminal Only

Screw Terminal Only

Application

Table 1 shows the ITA type/variant to be used with each type of
Regent + Plus I/O module.

Table 1 - Module / ITA Type

PD-7901

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5

I/O T

Module

ITA

Produc

t No

ITA Type

Comments

- -

Single Ended, No Current
Limiting Field Loop

Refer to Appendix B

T7444
T7401

T7402

T7408
T7404
T7441A

T7420A

T7420AF

790311

790111

790211

790111

790211

790311

790311

790111

790211

790111

790211

790111

790211

Screw Terminal Only

Screw Terminal Only
Screw Terminal Only

- -

Single Ended, Current Limiting
Dioded Supply

Refer to Appen

dix C

T7401

T7402

T7441

790112

790212

790112

790212

790112

790212

- -

Single Ended, Analog Current
Mode

Refer to Appendix D

T7420A

T7420AF

790113

790213

790113

790213

ermination Assembly

Table 1 (continued) - Module / ITA Type

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I/O Termination Assembly

Module

ITA

Produc

t No

ITA Type

Comments

- -

Single Ended, External
Current Limiting

Refer to Appendix E

T7411

T7411F

T7418F
T7401

T7402

T7408
T7404
T7420A

T7420AF

790114
790214

790114
790214

790314
790114

790214
790114

790214
790314
790314
790114

790214
790114

790214

Screw Terminal only

Screw Terminal only

Screw Terminal only

- -

Differential Analog Current
Mode

Refer to Appendix F

T7420A

T7420AF

790115
790215

790115
790215

- -

Differential, Field Loop with
Dioded Power Protection

Refer to Appendix G

Special Projects

Future Use

- -

Single Ended, No Current
Limiting in Field Loop with
Dioded Supply

Refer to Appendix H

Special Projects

Future Use

Table 1 (continued) - Module / ITA Type

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I/O T

ermination Assembly

Specifications

Electrical Specification

Power Supply Requirements:

T7901 & T7902
T7903
Current Carrying Capacity: 16A Max (Total)
RFI Immunity:

EMC:

Mechanical Specification

Dimensions (mm) Varelco:

Dependent on I/O variant.
Maximum values are given for
reference.

Screw Terminal: 170D x 110W x 65H

48VDC
120VAC/DC

27 to 500MHz at 10V/m
(3 axes)
400A/m at 50Hz (3 axes)

170D x 110W x 65H

Connector:

Weight:
Operating Temperature:
Shock:

Vib

ration:

Relative Humidity:
H2S Exposure:

Varelco 8016 Series
Screw Terminal

GSED5/32
Various
0 to 60oC
1/2 sine wave 6ms period,

10G peak (3 times) 3 axes
10 to 20Hz 0.5mm pp, 20 to

55Hz 1.0G peak in 3 axes
0 to 95% non-condensing
1ppm for 1 year with no

damage

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I/O Termination Assembly

Appendix A - Differential, Field Loop

YTMR790110
YTMR790210
YTMR790310

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
diagrams below:

(Right Hand Varelco Connector)
(Left Hand Varelco Connector)
(Screw Terminal Connector)

in the block

PD-7901

March, 06

Figure A-1. Varelco Left Hand Differential,

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Field Loop, Block Diagram.

I/O T

ermination 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

Connector

Pin Ident

Connector (J5) Pin

J2 S1 C
J2 S2 D
J2 S3 H
J2 S4 J
J2 S5 M
J2 S6 N
J2 S7 S
J2 S8 T
J4 S1 A
J4 S2 B
J4 S3 E
J4 S4 F
J4 S5 K
J4 S6 L
J4 S7 P
J4 S8 R
J7 S1 AA
J7 S2 BB
J7 S3 EE
J7 S4 FF
J7 S5 KK
J7 S6 LL
J7 S7 PP
J7 S8 RR
J9 S1 Y
J9 S2 Z
J9 S3 CC
J9 S4 DD
J9 S5 HH

The four 8-Way connectors are tracked to the connectors. as shown
in Tables A-1 and A-2.

Table A-1. Varelco Connections.

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11

J9 S6 JJ
J9 S7 MM
J9 S8 NN
J10 GND

U, V, W, X, SS, TT

Connector

Pin Ident

Connector (J5) Pin

J2 S1 3
J2 S2 4
J2 S3 7
J2 S4 8
J2 S5 11
J2 S6 12
J2 S7 15
J2 S8 16
J4 S1 1
J4 S2 2
J4 S3 5
J4 S4 6
J4 S5 9
J4 S6 10
J4 S7 13
J4 S8 14
J7 S1 19
J7 S2 20
J7 S3 23
J7 S4 24
J7 S5 27
J7 S6 28
J7 S7 31
J7 S8 32
J9 S1 17
J9 S2 18

I/O T

ermination Assembly

Table A-2. Screw Terminal Connections.

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J9 S3 21
J9 S4 22
J9 S5 25
J9 S6 26
J9 S7 29
J9 S8 30

I/O Termination Assembly

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I/O T

Connector
Ident

Pin Ident

Comments

J10

A

Connect to module
AREF1 & AREF2.
(T7420 only).

J10

B

Connect to AGND
(T7420 only).

J10

C

Connect to J10 (GND)
(T7420 only)

J10

D

No Connection.
J10

GND

Connect to ground if not
used on T7420. If used on
T7420, connect the Field
Analog Ground to Pin TT
of the Varelco Conne

ctor
and link J10 GND to J10
Pin C.

ermination 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. Varelco J10 Connection Details.

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I/O Termination Assembly

Connector
Ident

Pin Ident

Comments

J10

A

Connect to
AREF1/AREF2.
(T7420 only)

J10

B

Connect to AGND.
(T7420 only)

J10

C

Connect to Analog Gr

ound

AINGD. (T7420 only)
J10

D

Connect Cable Screen and
Ground.

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. Screw Terminal J10 Connection Details.

PD-7901

March, 06

15

I/O T

ermination Assembly

Appendix B - Single Ended, No Current Limiting, Field Loop

YTMR790111
YTMR790211
YTMR790311

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:

(Right Hand Varelco Connector)
(Left Hand Varelco Connector)
(Screw Terminal Connector)

16

The single ended signal is fed from the I/O chassis to the ITA. The ITA
p

rovides a common supply which is tracked out on the ITA to provide
each single ended signal with a feed/return supply path. Each field
loop is capable of carrying 2A. The overall maximum current of the
ITA should not exceed 16A total.

Single ended I/O modules have 16 field circuits and one ITA will be
required for each module.

The connector idents are shown on the legend on the ITA.
The block diagrams below show typical connection of the module to

the field device.

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I/O Termination Assembly

Figure B-1. Varel

Current Limiting, Field Loop, Block Diagram.

co Left Hand Single Ended, No

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.

PD-7901

March, 06

17

I/O T

Connector

Pin Ident

Connector (J5) Pin

J3 S1 A
J10 Common

Return /
Feed (A)

B

J3 S2 C
J10 A D
J3 S3 E
J10 A F
J3 S4 H
J10 A

J
J3 S5 K
J10 A L
J3 S6 M
J10 A

N
J3 S7 P
J10 A

R
J3 S8

S
J10 A T
J8 S1 Y
J10 A Z
J8 S2 AA
J10 A BB
J8 S3 CC
J10 A DD
J8 S4 EE
J10 A FF
J8 S5 HH
J10 A JJ
J8 S6 KK
J10 A LL
J8 S7 MM
J10 A NN

ermination Assembly

Table B-1. Varelco Connections.

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