II - DCE FEL ČVUT v Praze
II - DCE FEL ČVUT v Praze
II - DCE FEL ČVUT v Praze
You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
Errors and<br />
corrective<br />
measures<br />
I/O Modules with Intrinsically-Safe Signals<br />
C79000-G7076-C152-04<br />
Table 2-6 provides a list of possible causes and corresponding corrective<br />
measures for individual diagnostic 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 2-6 Diagnostic messages as well as their causes and corrective measures in<br />
SM 321; DI 4 x NAMUR<br />
Diagnostic<br />
message<br />
Short to M<br />
(I > 8.5 mA)<br />
Wire break<br />
I 0.1 mA)<br />
Incorrect<br />
parameters in<br />
module<br />
Module not<br />
parameterized<br />
No external<br />
auxiliary supply<br />
No internal<br />
auxiliary ili supply l<br />
Possible fault cause Corrective measures<br />
Short-circuit between the two sensor<br />
lines<br />
With contacts as sensor<br />
1 k series resistor not fitted in line to<br />
contact<br />
Conductor break between module and<br />
NAMUR sensor<br />
Contact as sensor (wire break<br />
monitoring enabled)<br />
Contacts as sensor<br />
(without monitoring)<br />
Channel not used (open)<br />
Invalid parameters loaded in module by<br />
means of SFC<br />
Eliminate short-circuit<br />
Connect 1 k resistor in line directly<br />
at contact<br />
Make conductor connection<br />
10 k resistor not fitted or interrupted<br />
directly at contact<br />
Disable channel by parameterization<br />
”diagnostics wire break”<br />
Check parameterization of module and<br />
re-load valid parameters<br />
No parameters loaded in module Include module in parameterization<br />
No L+ supply voltage of module Supply L+<br />
No L+ supply voltage of module Supply L+<br />
Module-internal fuse defective Replace module<br />
Fuse blown Module-internal fuse defective Replace module<br />
Watchdog<br />
triggered<br />
EPROM error<br />
RAM error<br />
CPU error<br />
Hardware<br />
interrupt lost<br />
In part, high electromagnetic<br />
interference<br />
Eliminate interference sources<br />
Module defective Replace module<br />
In part, high electromagnetic<br />
interference<br />
Module defective Replace module<br />
Succession of hardware interrupt is<br />
faster than the CPU can process<br />
SIMATIC S7 Ex Digital Modules<br />
Eliminate interference sources and<br />
switch CPU supply voltage OFF/ON<br />
Change interrupt processing in CPU<br />
and reparameterize module if<br />
necessary<br />
2-11
Change language