Siemens Simatic S7-400 - Manual (Page 592)

Diagnostic Data of the Signal Modules
B-18
S7-400, M7-400 Programmable Controllers Module Specifications
A5E00069467-07
Bytes 2 and 3 of the SM 431; AI 8 16 Bit
Byte 2
7 6 0
Operating status 0: RUN
1: STOP
5 4 3 2 1
0
Byte 3
7 6 0
EPROM error
ADC/DAC error
Hardware interrupt lost
5 4 3 2 1
0
0 0 0 0 0
0 0 0
Thermocouple connection error
RAM error
Figure B-24 Bytes 2 and 3 of the Diagnostic Data of the SM 431; AI 8 x 16 Bit
Bytes 4 to 7 of the SM 431; AI 8 16 Bit
Byte 4
7 6 0 5 4 3 2 1
Byte 5
7 0
Channel type B#16#71: analog input
Number of diagnostic bits that the module
outputs per channel: 16 bits long
Byte 6
7 0
Number of channels of the same
type in one module: 8 channels
Byte 7
7 6 0
Channel error, channel 0
Channel error, channel 1
Channel error, channel 6
Channel error, channel 7
5 4 3 2 1
...
...
...
...
...
0
Figure B-25 Bytes 4 to 7 of the Diagnostic Data of the SM 431; AI 8 x 16 Bit