Sil 2 Check Data - Rockwell Automation Allen-Bradley 1715-AENTR User Manual

Chapter 8 Using SIL 2 Add-On Instructions with 1715 Redundant I/O Modules
1715-OF8 Input Data Packet
1715- 1715-
TASOF8 TASOF8
TERMINAL IDENTITY TERMINAL IDENTITY TERMINAL IDENTITY
CH1 CH1 CH1 CH1 CH1 CH1 CH1 CH1 CH1 CH1 CH1 CH1
CH1 CH1 CH1 CH1
CH1 CH1 CH1 CH1 CH1 CH1 CH1 CH1
AOTA AOTA AOTA
Dual. Dual. Dual.
1715-A2A 1715-A3IO
1715-OF8 Configuration Tag
1756 Controller Tags
1715-OF8 Configuration Tag
Module Configuration
Important: The 1715-OF8 module is shown, but the example also applies to the 1715-OB8DE module.

SIL 2 Check Data

224
Figure 70 - Diagram of Output Module Add-On Instruction
Input Data (status)
SIL 2 Check Data
Module Configuration
Check Data
Safe State Defaults
Requested
Output Data
The Add-On Instruction
adds the check data to the
requested output data and
generates a sequence
number and CRC to
generate the output
data packet
Module Configuration
Check Data
The instructions gather data from the module-defined configuration tags for
the following check data values
Rockwell Automation Publication 1715-UM001J-EN-P - December 2020
Input Data System
OF8_Duplex_SIL2 Add-On Instruction
SIL 2 Check Data
The Add-On
Instruction verifies
the check data.
Module Configuration
Check Data
Safe State Defaults
Output Data System
OF8_Duplex_SIL2 Add-On Instruction
Requested
Output Data
Generate Sequence
Number
Generate CRC
Check Data
.
1756 Controller Tags
Input Data
Reconciled Reconciled
Input Data Input Data
1715-OF8 Data Packet
1715-A2A
Output Data Output Data
1715- 1715-
TASOF8 TASOF8
TERMINAL IDENTITY
TERMINAL IDENTITY TERMINAL IDENTITY
CH1 CH1 CH1 CH1 CH1 CH1 CH1 CH1 CH1 CH1 CH1 CH1
CH1 CH1 CH1 CH1 CH1 CH1 CH1 CH1 CH1 CH1 CH1 CH1
AOTA AOTA AOTA
Dual. Dual. Dual.
1715-A3IO