II - DCE FEL ČVUT v Praze
II - DCE FEL ČVUT v Praze
II - DCE FEL ČVUT v Praze
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SIMATIC S7 Ex Digital Modules<br />
Reading out<br />
diagnostic<br />
messages<br />
Faults and<br />
corrective<br />
measures<br />
2-22<br />
You can read out system diagnostics with STEP 7. You can read detailed<br />
diagnostic messages from the module in the user program with SFC 59 (refer<br />
to /235/).<br />
Table 2-12 provides a list of possible causes, marginal conditions for fault<br />
recognition and corresponding corrective measures for individual diagnostic<br />
messages.<br />
Bear in mind that, in order to detect faults which are indicated by means of<br />
configurable diagnostic messages, must also be parameterized accordingly.<br />
Table 2-12 Diagnostic messages as well as fault causes and corrective measures for<br />
SM 322; DO 4 x 24V/10mA and SM 322; DO 4 x 15V/20mA<br />
Diagnostic message Fault<br />
recognition<br />
at<br />
Possible fault cause Corrective measures<br />
Chassis ground Only when Output overload Eliminate overload<br />
short-circuit h t i it<br />
output t t at t ”1”<br />
Short-circuit between the<br />
two output lines<br />
Eliminate short-circuit<br />
Wire break Only when<br />
output at ”1”<br />
No-load voltage Only when<br />
output at ”1”<br />
Incorrect parameters<br />
in module<br />
Module not<br />
parameterized<br />
No external auxiliary<br />
supply<br />
No internal auxiliary<br />
supply<br />
Conductor break between<br />
module and actuator<br />
Make conductor connection<br />
Channel not used (open) Disable channel by<br />
parameterization<br />
”diagnostics wire break”<br />
Failure of internal channel<br />
supply voltage<br />
General Invalid parameters loaded in<br />
module by means of SFC<br />
General Invalid parameters loaded in<br />
module by means of SFC<br />
General No L+ supply voltage of<br />
module<br />
General No L+ supply voltage of<br />
module<br />
Module-internal fuse<br />
defective<br />
Fuse blown General Module-internal fuse<br />
defective<br />
Time watchdog<br />
tripped<br />
EPROM error<br />
RAM error<br />
General High electromagnetic<br />
interference at times<br />
Replace module<br />
Check parameterization of<br />
module and re-load valid<br />
parameters<br />
Check parameterization of<br />
module and re-load valid<br />
parameters<br />
Supply L+<br />
Supply L+<br />
Replace module<br />
Replace module<br />
Eliminate interference<br />
sources and switch CPU<br />
supply voltage OFF/ON<br />
CPU error Module defective Replace module<br />
I/O Modules with Intrinsically-Safe Signals<br />
C79000-G7076-C152-04
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