Digital modules
8.5 SM 326; DO 8 x DC 24V/2A PM
Fail-safe signal modules
Installation and Operating Manual, 01/2010, A5E00085586-10
135
Causes of the problem and corrective measures
The table below shows the possible causes of the problem and associated corrective
measures for the individual diagnostic messages of the SM 326, DO 8 x DC 24V/2A PM.
Table 8- 18 Diagnostic messages and associated corrective measures for SM 326; DO 8 x DC
24V/2A PM
Diagnostic
message
Error detection Possible causes of the
problem
Corrective measures
Wire break between the
module and actuator
Restore the cable
connection
Wire break General
Channel not connected (open)
or unused
Disable the "Group
Diagnostics" for the
channel in the parameter
settings.
Output overload Eliminate the cause of
overload
Short-circuit between the M
output and M of the module
power supply
Eliminate the short-
circuit. Reset the module
by cycling supply voltage
1L+ off/on
Undervoltage at load voltage
supply
Check the load voltage
supply
Short-circuit of
output to M, or
defective output
driver
General
Defective output driver Replace the module
Short-circuit between the
output and L+ of the module
power supply
Eliminate the short-
circuit
Module reset required
(supply voltage 1L+
off/on)
Short-circuit between
channels which carry different
signals
Eliminate the short-
circuit
Module reset required
(supply voltage 1L+
off/on)
Short circuit of
output to L+, or
defective output
driver
General
Defective output driver Replace the module
Short-circuit at the
load; or defective
output driver
General Short-circuit at the load Eliminate the short-
circuit; reset of module
required (supply voltage
1L+ off/on)
Defective module Replace the module Defective output
driver
General
Short-circuit at the output Eliminate the short-
circuit. Reset the module
by cycling supply voltage
1L+ off/on
Output overload Eliminate the cause of
overload
Overtemperature at
output driver
General
Internal fault at output driver Replace the module
External load
voltage missing
General Supply voltage 1L+ of module
missing
Connect 1L+
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