Interrupts Of Sm 321; Di 16 X Dc 24/125 V - Siemens SIMATIC Manual
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Digital modules
3.12 Digital input module SM 321; DI 16 x DC 24/125 V; with hardware and diagnostic interrupts (6ES7321-
7EH00-0AB0)
Special features of diagnostics
The SM 321; DI 16 x DC 24 V/125 V supplies 9-byte diagnostic data (diagnostic data set 0
with a length of 4 bytes and the diagnostic data set 1 with a length of 9 bytes).
The wire-break diagnostics is only reported in the channel error vector of the data set 1
(bytes 7 and 8). Each channel that reports an error in the channel errror vector has a wire-
break. You can find additional information, in chapter Structure and content of diagnostics
data, byte 0 and up (Page 584).
Causes of error and troubleshooting
Table 3- 20
Diagnostics messages of SM 321; DI 16 x DC 24 V/125V, causes of error and troubleshooting
Diagnostic message
Incorrect module parame-
ters
Time monitoring activated
(watchdog)
EPROM fault
RAM fault
Hardware interrupt lost
Module not programmed
3.12.3
Interrupts of SM 321; DI 16 x DC 24/125 V
Introduction
This chapter describes the interrupt reaction of SM 321; DI 16 x DC 24 V/125V. Always
distinguish between the following interrupts:
● Diagnostic interrupt
● Hardware interrupt
For detailed information on the OBs and SFCs mentioned below, refer to the STEP 7 Online
Help.
100
Possible cause of error
Implausible parameter or combination thereof Program the module
Infrequent high electromagnetic interference
Module defective
Infrequent high electromagnetic interference
Module defective
Infrequent high electromagnetic interference
Module defective
The module can not output an interrupt, be-
cause the previous interrupt was not
acknowledged; possibly a configuration error
Startup error
To correct or avoid error
Eliminate the interference
Replace the module
Eliminate interference and cycle the power
supply of CPU off/on.
Replace the module
Eliminate interference and cycle the power
supply of CPU off/on.
Replace the module
Change interrupt processing in the CPU, and
reprogram the module as required
The error persists until the module is assigned
new parameters
Program the module
Manual, 06/2017, A5E00105505-AJ
S7-300 Module data
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