Siemens SIMATIC - Diagnostics of SM 321; DI 16 X DC 24;125 V

Digital modules
3.12 Digital input module SM 321; DI 16 x DC 24/125 V; with hardware and diagnostic interrupts (6ES7321-7EH00-0AB0)
S7-300 Module data
Manual, 06/2017, A5E00105505-AJ
99
Tolerances of the programmable input delays
Table 3- 18 Tolerances of the input delays of SM 321; DI 16 x DC 24 V/125 V
Programmed input delay
Tolerance
0.1 ms
80 μs to 200 μs
0.5 ms 580 μs to 700 μs
3 ms (default)
3.1 ms to 3.7 ms
15 ms
15.1 ms to 18.1 ms
20 ms
20.1 ms to 24.1 ms
Note
The timers for the input delay are only valid for reading in the status. In the case of wire
-
break, "Wire
-break diagnostics" is only triggered approx. 40 ms after the reading in of the
value.
3.12.2 Diagnostics of SM 321; DI 16 x DC 24/125 V
Diagnostic messages of SM 321; DI 16 x DC 24 V/125 V
The table below shows an overview of the diagnostic messages of SM
321; DI 16 x DC 24 V/125 V.
Table 3- 19 Diagnostic messages of SM 321; DI 16 x DC 24 V/125 V
Diagnostic message
LED
Scope of diagnostics
programmable
Wire break
SF
Channel
Yes
No channel parameters
SF
Channel
No/incorrect parameters in module
SF
Module
No
Time monitoring activated (watchdog)
SF
Module
EPROM fault
SF
Module
RAM fault
SF
Module
Hardware interrupt lost
SF
Module
Note
To detect the errors indicated by programmable diagnostic messages, you must have
programmed t
he digital module accordingly in STEP 7.