II - DCE FEL ČVUT v Praze

SIMATIC S7 Ex Digital Modules
Diagnostics of the
digital input
module
Reading out
diagnostic
messages
2-10
Table 2-5 provides an overview of the diagnostic messages of the SM 321;
DI 4 x NAMUR. You enable diagnostics in STEP 7 (see Table 2-3).
The diagnostics information refers to either the channel groups or the entire
module.
Table 2-5 Diagnostic messages of SM 321; DI 4 x NAMUR
Wire break
Short to M
Diagnostic message Effective range of
diagnostics
Incorrect parameters in module
Module not parameterized
No external auxiliary supply
No internal auxiliary supply
Fuse blown
Watchdog triggered
EPROM error
RAM error
CPU error
Hardware interrupt lost
configurable
Channel group yes
Module no
You can read out system diagnostics with STEP 7. You can read detailed
diagnostic messages from the module in the user program with SFC 59 (refer
to /235/).
I/O Modules with Intrinsically-Safe Signals
C79000-G7076-C152-04