Siemens Simatic S7-300, Инструкция по установке и эксплуатации

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Digital modules
8.3 SM 326; DI 24 x DC 24V
Fail-safe signal modules
100
Installation and Operating Manual, 01/2010, A5E00085586-10
Short-circuit to M and L+
Sequence of the internal short-circuit tests:
●
Short-circuit to chassis ground is always tested, independent of the configuration.
● Short-circuit to L+ is only tested if "Sensor supply via module" and "Short-circuit test" are
configured in
HW Config.
Causes of the problem and corrective measures
The table below shows possible causes of the problem and appropriate corrective measures
for the individual diagnostic messages of SM 326; DI 24 x DC 24V.
Table 8- 9 Diagnostic messages and associated corrective measures for SM 326; DI 24 x DC 24V
Diagnostic message Possible causes of the problem Corrective measures
Internal short-circuit or
defective sensor supply
Internal sensor supply error Replace the module
Short-circuit to L+ on the
unconnected sensor line
(open contact)
Short circuit to L+ of the unconnected
sensor line (open contact)
Eliminate the short-circuit
Short-circuit of input to M Eliminate the short-circuit Ground-short circuit or
defective sensor supply
Internal sensor supply error Replace the module
Short-circuit of the unconnected
sensor line to M
Eliminate the short-circuit Short-circuit at open sense
line (open contact)
Interruption of the line between the
module and sensor
Restore the cable connection
Process signal error
Defective sensor Check the process signal;
replace the sensor
Discrepancy error
(1oo2 evaluation)
Assigned discrepancy time too short Check the discrepancy time
parameters
No external auxiliary
voltage
Module supply voltage L+ missing Connect supply voltage L+
Module parameters not
assigned
No parameters transferred to module Assign new module parameters
Incorrect module
parameters
Faulty parameters transferred to
module
Assign new module parameters
Error in communication between the
CPU and the module, for example,
due to defective PROFIBUS
connection or electromagnetic
interference in excess of limits.
Check the PROFIBUS
connection
Eliminate the interference
Timeout of safety message frame
monitoring
Check the monitoring time
parameters
CRC signature error, for example,
due to electromagnetic interference
in excess of limits.
Eliminate the interference
Communication error
CPU is in STOP Read the diagnostics buffer
Internal supply voltage of
the module failed
Internal fault at the L+ supply voltage Replace the module