Digital modules
8.3 SM 326; DI 24 x DC 24V
Fail-safe signal modules
Installation and Operating Manual, 01/2010, A5E00085586-10
99
8.3.9
Diagnostic messages of SM 326; DI 24 x DC 24V
Diagnostics using the LED display
The F-SM indicates faults by means of its SF LED (group fault LED). The SF LED is
activated when the F-SM generates a diagnostic message.
The SF LED flashes as long as a cleared fault has not been acknowledged. It goes dark
when all faults have been eliminated and acknowledged.
The SF LED flashes until you acknowledge passivation following a module fault.
Possible diagnostic messages
The following table provides an overview of the diagnostic messages for SM 326; DI 24 x DC
24V.
Diagnostic messages are assigned either to a channel or to the entire module. Some
diagnostic messages occur only in certain applications.
Table 8- 8
Diagnostic messages of SM 326; DI 24 x DC 24V
Diagnostic message
Signaled in the
application
Effective
range of
diagnostics
Assignable
Internal short-circuit or defective sensor supply
Short-circuit to L+ on the unconnected sensor
line (open contact)
Ground-short circuit or defective sensor supply
1, 2, 3, 4, 5, 6
Discrepancy error
(1oo2 evaluation)
5, 6
Channel
Yes
No external auxiliary voltage
Module parameters not assigned
Incorrect module parameters
Communication error
Internal supply voltage of the module failed
Time monitoring activated (watchdog)
EPROM error
RAM error
Processor failure
Parameter assignment error (with specification of
a consecutive number)
1, 2, 3, 4, 5, 6
Module
Internal error in read circuit/test circuit
1, 2, 3, 4, 5, 6
Channel
CRC signature error
Timeout of safety message frame monitoring
3, 4, 5, 6
Module
Message frame error
1,2
Module
No
