Rockwell Automation Trusted T8833 User manual

ICSTT-RM294E-EN-P (PD-T8833) Trusted
Rockwell Automation Publication ICSTT-RM294E-EN-P Issue 5
Trusted 20 Channel Isolated AI/DI FTA Loop
Powered
Product Overview
The Trusted® 20 Channel Isolated Analogue Input/Digital Input (AI/DI) Field Termination Assembly
(FTA), Part Number: T8833, is designed to act as the main interface between a field device
generating a 4 20 mA signal and the Isolated Analogue Input Module, Part Number: T8433.
Features:
•20 isolated input channels per FTA.
•Standard DIN rail compatibility.
•Simple installation and connection.
•Loop powered operation.

Trusted ICSTT-RM294E-EN-P
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Trusted 20 Channel Isolated AI/DI FTA Loop Powered PREFACE
Rockwell Automation Publication ICSTT-RM294E-EN-P Issue 5 i
PREFACE
In no event will Rockwell Automation be responsible or liable for indirect or consequential damages
resulting from the use or application of this equipment. The examples given in this manual are
included solely for illustrative purposes. Because of the many variables and requirements related to
any particular installation, Rockwell Automation does not assume responsibility or reliability for
actual use based on the examples and diagrams.
No patent liability is assumed by Rockwell Automation, with respect to use of information, circuits,
equipment, or software described in this manual.
Allen‐Bradley, LISTEN. THINK. SOLVE., Rockwell Automation, TechConnect, and Trusted are
trademarks of Rockwell Automation, Inc.
Trademarks not belonging to Rockwell Automation are property of their respective companies.
All trademarks are acknowledged.
DISCLAIMER
It is not intended that the information in this publication covers every possible detail about the
construction, operation, or maintenance of a control system installation. You should also refer to
your own local (or supplied) system safety manual, installation and operator/maintenance manuals.
REVISION AND UPDATING POLICY
This document is based on information available at the time of its publication. The document
contents are subject to change from time to time. The latest versions of the manuals are available at
the Rockwell Automation Literature Library under "Product Information" information "Critical
Process Control & Safety Systems".
TRUSTED RELEASE
This technical manual was updated for Trusted Release 4.0.
LATEST PRODUCT INFORMATION
For the latest information about this product review the Product Notifications and Technical Notes
issued by technical support. Product Notifications and product support are available at the Rockwell
Automation Support Centre at
http://rockwellautomation.custhelp.com
At the Search Knowledgebase tab select the option "By Product" then scroll down and select the
Trusted product.
Some of the Answer ID’s in the Knowledge Base require a TechConnect℠Support Contract. For more
information about TechConnect Support Contract Access Level and Features please click on the
following link:
https://rockwellautomation.custhelp.com/app/answers/detail/a_id/50871

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This will get you to the login page where you must enter your login details.
IMPORTANT A login is required to access the link. If you do not have an account then you can create one
using the "Sign Up" link at the top right of the web page.
DOCUMENTATION FEEDBACK
Your comments help us to write better user documentation. If you discover an error, or have a
suggestion on how to make this publication better, send your comment to our technical support
group at http://rockwellautomation.custhelp.com

Trusted 20 Channel Isolated AI/DI FTA Loop Powered PREFACE
Rockwell Automation Publication ICSTT-RM294E-EN-P Issue 5 iii
SCOPE
This manual specifies the maintenance requirements and describes the procedures to assist
troubleshooting and maintenance of a Trusted system.
WHO SHOULD USE THIS MANUAL
This manual is for plant maintenance personnel who are experienced in the operation and
maintenance of electronic equipment and are trained to work with safety systems.
SYMBOLS
In this manual we will use these notices to tell you about safety considerations.
SHOCK HAZARD: Identifies an electrical shock hazard. If a warning label is fitted, it
can be on or inside the equipment.
WARNING: Identifies information about practices or circumstances that can cause
an explosion in a hazardous environment, which can cause injury or death,
property damage or economic loss.
ATTENTION: Identifies information about practices or circumstances that can cause
injury or death.
CAUTION: Identifies information about practices or circumstances that can cause
property damage or economic loss.
BURN HAZARD: Identifies where a surface can reach dangerous temperatures. If a
warning label is fitted, it can be on or inside the equipment.
This symbol identifies items which must be thought about and put in place when
designing and assembling a Trusted controller for use in a Safety Instrumented
Function (SIF). It appears extensively in the Trusted Safety Manual.
IMPORTANT Identifies information that is critical for successful application and understanding of
the product.
NOTE Provides key information about the product or service.
TIP Tips give helpful information about using or setting up the equipment.

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WARNINGS AND CAUTIONS
WARNING: EXPLOSION RISK
Do not connect or disconnect equipment while the circuit is live or unless the area is
known to be free of ignitable concentrations or equivalent
AVERTISSEMENT - RISQUE D’EXPLOSION
Ne pas connecter ou déconnecter l’équipement alors qu’il est sous tension, sauf si
l’environnement est exempt de concentrations inflammables ou équivalente
MAINTENANCE
Maintenance must be carried out only by qualified personnel. Failure to follow these
instructions may result in personal injury.
CAUTION: RADIO FREQUENCY INTERFERENCE
Most electronic equipment is influenced by Radio Frequency Interference. Caution
should be exercised with regard to the use of portable communications equipment
around such equipment. Signs should be posted in the vicinity of the equipment
cautioning against the use of portable communications equipment.
CAUTION:
The module PCBs contains static sensitive components. Static handling precautions
must be observed. DO NOT touch exposed connector pins or attempt to dismantle a
module.

Trusted 20 Channel Isolated AI/DI FTA Loop Powered PREFACE
Rockwell Automation Publication ICSTT-RM294E-EN-P Issue 5 v
ISSUE RECORD
Issue Date Comments
2 Sep 05 Format
3 Aug 06 Termination
4 Jun 16 Rebranded and updated to incorporate IEEE standards with correction of
typographical errors and also standardise the Relative Humidity Range
and Operating Temperature statements in the Specification Section.
5 Dec 18 Updated Specifications table.
Updated graphics in various sections.
Updated header and footer to display Rockwell Automation publication
number.
Added trademarks statement.

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Trusted 20 Channel Isolated AI/DI FTA Loop Powered Table of Contents
Rockwell Automation Publication ICSTT-RM294E-EN-P Issue 5 1
Table of Contents
1. Description ............................................................................................................ 3
2. Installation............................................................................................................5
3. Associated Cable Selection......................................................................................7
4. Assembly PinoutConnections ................................................................................. 9
4.1. CON1 Connections ..................................................................................................................... 9
4.2. TB1 Connections ...................................................................................................................... 11
5. Specifications....................................................................................................... 13

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Trusted 20 Channel Isolated AI/DI FTA Loop Powered 1. Description
Rockwell Automation Publication ICSTT-RM294E-EN-P Issue 5 3
1. Description
Figure 1 T8833 Layout
The Trusted 20 Channel Isolated Analogue Input FTA (T8833), provides termination for a
maximum of 20 input channels from various types of field devices which generate a current
loop signal. When used with a Trusted TMR Isolated Analogue Input Module (T8433) each of
the inputs is loop powered and individually isolated. Figure 2 below shows the configuration
of a single channel.
Figure 2 Single Channel Schematic
The FTA is configured so that the 4‐20 mA field current loop signal connects to TB1 A and
the loop return connects to TB1 B. The current loop signal is then converted into a voltage
by the circuit in Figure 2. This voltage is split into a 7.5 Vdc low current power supply to
power the isolation amplifiers on the input module (VPOWER) and the precision 0‐2 V
current sense signal (VSENSE) connected to the input module. Both of these voltages are
referenced to (COMMON).
This means that input module operates on the loop power of the field devices. This way
each field device is isolated from the other devices and from ground.
TB1 A
TB1 B
100 Ω
7V5
CON1 VPOWER
CON1 COMMON
CON1 VSENSE
+

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The connector linking the 20 channels on the input module to the FTA is terminated at
CON1 which is a 96‐way socket. A row of screw terminal connectors (TB1) are used to
connect the field wiring.
Unused inputs should be terminated by wiring a 24 V supply via a resistor (2K or 2K2) to the
A terminal and wiring the B terminal to the associated zero volts.

Trusted 20 Channel Isolated AI/DI FTA Loop Powered 2. Installation
Rockwell Automation Publication ICSTT-RM294E-EN-P Issue 5 5
2. Installation
The Trusted 20 Channel Isolated AI/DI FTA (T8833) is designed to be mounted on either of
the TS32 or TS35 DIN rails in the horizontal or vertical positions as required. The location of
the connectors on the FTA are shown in Figure 3.
Figure 3 Connector Locations

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Trusted 20 Channel Isolated AI/DI FTA Loop Powered 3. Associated Cable Selection
Rockwell Automation Publication ICSTT-RM294E-EN-P Issue 5 7
3. Associated Cable Selection
Refer to the Product Descriptions detailed below:
ICSTT‐RM314 (PD‐TC600) Trusted I/O SmartSlot Cables 60 Channel
ICSTT‐RM315 (PD‐TC700)Trusted I/O Companion Slot Cables 60 Channel
Note: 60 channel cables are used for this FTA due to the three wire per channel connection to the input
module.

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Trusted 20 Channel Isolated AI/DI FTA Loop Powered 4. Assembly Pinout Connections
Rockwell Automation Publication ICSTT-RM294E-EN-P Issue 5 9
4. Assembly Pinout Connections
4.1. CON1 Connections
CON1 is a 96 Way DIN 41612 socket. The connections are detailed below:
Pin
Row
A B C
1 N/C N/C N/C
2 N/C N/C N/C
3 CH1_VPOWER CH1_COMMON CH1_VSENSE
4 CH2_VPOWER CH2_COMMON CH2_VSENSE
5 CH3_VPOWER CH3_COMMON CH3_VSENSE
6 CH4_VPOWER CH4_COMMON CH4_VSENSE
7 CH5_VPOWER CH5_COMMON CH5_VSENSE
8 CH6_VPOWER CH6_COMMON CH6_VSENSE
9 CH7_VPOWER CH7_COMMON CH7_VSENSE
10 CH8_VPOWER CH8_COMMON CH8_VSENSE
11 CH9_VPOWER CH9_COMMON CH9_VSENSE
12 CH10_VPOWER CH10_COMMON CH10_VSENSE
13 CH11_VPOWER CH11_COMMON CH11_VSENSE
14 CH12_VPOWER CH12_COMMON CH12_VSENSE
15 CH13_VPOWER CH13_COMMON CH13_VSENSE
16 CH14_VPOWER CH14_COMMON CH14_VSENSE
17 CH15_VPOWER CH15_COMMON CH15_VSENSE
18 CH16_VPOWER CH16_COMMON CH16_VSENSE
19 CH17_VPOWER CH17_COMMON CH17_VSENSE

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Pin
Row
A B C
20 CH18_VPOWER CH18_COMMON CH18_VSENSE
21 CH19_VPOWER CH19_COMMON CH19_VSENSE
22 CH20_VPOWER CH20_COMMON CH20_VSENSE
23 N/C N/C N/C
24 N/C N/C N/C
25 N/C N/C N/C
26 N/C N/C N/C
27 N/C N/C N/C
28 N/C N/C N/C
29 N/C N/C N/C
30 N/C N/C N/C
31 N/C N/C N/C
32 N/C N/C N/C
Table 1 CON1 Connections

Trusted 20 Channel Isolated AI/DI FTA Loop Powered 4. Assembly Pinout Connections
Rockwell Automation Publication ICSTT-RM294E-EN-P Issue 5 11
4.2. TB1 Connections
TB1 is a row of screw terminals. Figure 3 shows how they are numbered. The connections
are detailed below:
Pin Service Pin Service
1 CH1_A 21 CH11_A
2 CH1_B 22 CH11_B
3 CH2_A 23 CH12_A
4 CH2_B 24 CH12_B
5 CH3_A 25 CH13_A
6 CH3_B 26 CH13_B
7 CH4_A 27 CH14_A
8 CH4_B 28 CH14_B
9 CH5_A 29 CH15_A
10 CH5_B 30 CH15_B
11 CH6_A 31 CH16_A
12 CH6_B 32 CH16_B
13 CH7_A 33 CH17_A
14 CH7_B 34 CH17_B
15 CH8_A 35 CH18_A
16 CH8_B 36 CH18_B
17 CH9_A 37 CH19_A
18 CH9_B 38 CH19_B
19 CH10_A 39 CH20_A
20 CH10_B 40 CH20_B
Table 2 TB1 Connections

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