104 Rockwell Automation Publication 1791ES-UM001G-EN-P - November 2016
Appendix A Get Diagnostic Status from Modules by Using Explicit Messaging
Figure 35…Figure 39 show the MSG instruction parameters to read Instance 
852 from the 1791ES-IB8XOBV4 module.
Figure 35 - Instance 852 Configuration Tab
Instance 852 (354 hex) is 5 bytes in length, so the destination tag MSGdata 
must be at least 5 bytes in length to hold this data. The size is DINT[2] or 8 
bytes (see Ta b l e 34
).
3. Click the Communication tab.
This dialog box requires the path to the module. 
4. Click Browse to select the module that the MSG reads.
Table 34 - Layout of Instance 852 (354 hex) – 1791ES-IB8XOBV4 Module
Instance Hex 
(decimal)
Connection 
Type
ByteBit 7Bit 6Bit 5Bit 4Bit 3Bit 2Bit 1Bit 0
354 (852) Safety and 
standard
0 Safety Input 7 Safety Input 6 Safety Input 5 Safety Input 4 Safety Input 3 Safety Input 2 Safety Input 1 Safety Input 0
1Safety Input 7 
Status
Safety Input 6 
Status
Safety Input 5 
Status
Safety Input 4 
Status
Safety Input 3 
Status
Safety Input 2 
Status
Safety Input 1 
Status
Safety Input 0 
Status
2Safety Output 
7 Status
Safety Output 
6 Status
Safety Output 
5 Status
Safety Output 
4 Status
Safety Output 
3 Status
Safety Output 
2 Status
Safety Output 
1 Status
Safety Output 
0 Status
3Safety Output 
7 Monitor
Safety Output 
6 Monitor
Safety Output 
5 Monitor
Safety Output 
4 Monitor
Safety Output 
3 Monitor
Safety Output 
2 Monitor
Safety Output 
1 Monitor
Safety Output 
0 Monitor
4 Reserved Reserved Input Power 
Error 
(1)
Output Power 
Error
 (1)
Reserved Reserved Muting Lamp 7 
Status
Muting Lamp 3 
Status
(1) This data is only diagnostic data. This data does not have safety integrity.