Overview of ICS Triplex T8121 Processor Interface Adapter
1、 Product positioning and clarification
Project Description
Product model T8121
The full name of the product is Trusted TMR Processor Interface Adapter (Processor Intfc Adapter)
Product Type: Processor Interface Adapter (Non Independent Processor Module)
Manufacturer ICS Triplex (Schneider Electric/Rockwell Automation)
Belonging to the Trusted Triple Modular Redundancy (TMR) system
Important note: T8121 does not perform any logic or signal processing. Its function is to provide communication port access for Trusted TMR processors, used to connect distributed control systems (DCS) and other systems
.

2、 Core functional characteristics
1. Main functions
Function Description
The communication port interface provides external communication port access for Trusted TMR processors
IRIG-B time synchronization supports receiving IRIG-B002 or IRIG-B122 time synchronization signals
Enhanced peer-to-peer connectivity enables enhanced inter processor peer-to-peer connectivity functionality
MODBUS Master operation can turn a trusted system into a MODBUS host (requires cooperation with T8122 or T8123)
DCS system integration is used to connect distributed control systems and other external links
2. Comparison of Model Series
Model Function Characteristics Remarks
T8120 basic module with serial port and auxiliary connection terminator
Basic Edition
T8121 enables IRIG-B function including time synchronization function
T8122 enables MODBUS Master function
MODBUS host mode
T8123 simultaneously enables IRIG-B and MODBUS Master
Full featured version
3、 Hardware specifications and installation
1. Physical installation location
Project Description
Installation position: at the rear of the rack, behind the processor slot
The two connectors need to be aligned with the third and sixth slots from the right
Installation method: Insert the adapter downwards by about 5mm and then push it upwards until it locks onto the buckle
2. Connector interface
Connector type function
SK1 Processor Interface Connector Processor Interface Connection
J2, J3 Fault/Tail Connectors faulty connections
J6 PSU Shutdown Monitor Power Monitoring
J7, J12 Serial Port 1 (Diagnostic) Diagnostic Serial Port
J8-J11 Serial Ports 2 and 3 Extra Serial Ports
J5, J13 IRIG-B Connectors IRIG-B time signal input
4、 Compatible system module
T8121 can be used in conjunction with the following modules:

Module category compatible model
Main processors T8110B, T8110C
Communication interfaces T8151B and T8151C
Digital I/O T8310, T8312, T8801
Analog I/O T8431, T8442
Power modules T8220, T8222, T8225
Other adapters T8120, T8122, T8123
5、 Application Fields
Industry application scenarios
Safety Instrumented System (SIS) for Power System and Power Plant
Petrochemical Emergency Shutdown System (ESD)
Natural gas fire and gas detection system (F&G)
Discrete automation motor and drive system control
Automatic control and interlocking function in spandex production
6、 Technical document resources
Document Type Document Number Source
Technical Manual ICSTT-RM239J-EN-P Rockwell Automation
Product Manual PD-T812X Rockwell Automation