User manual

Modbus Commands
2-28
SIMATIC TI505/TI500 MODNIM User Manual
Modbus Function Descriptions (continued)
Diagnostic Code — 12
0012 | 00 00
Diagnostic code
Information frame
When Function Code 08 uses diagnostic code 0012 and any value in the
information field (00 00 shown), the information field will return the
number of character overruns detected by the MODNIM since the last
RESET or power -up. This indicates the number of times that characters
have arrived faster than the UART can store them without loss. The
counter will increment to a value of FFFF (65535) and will then return to
zero (0).
This code has no effect on the operation of the MODNIM.
Diagnostic Code — 13
0013 | 00 00
Diagnostic code
Information frame
When Function Code 08 uses diagnostic code 0013 and any value in the
information field (00 00 shown), the MODNIM will return 0000 in the
information field.
This code has no effect on the operation of the MODNIM.
This Modbus diagnostic code has no equivalent in Series 500 or Series 505
PLCs. In this application, 0000 is always returned.