Siemens SIMATIC S7 - Page 33

4-11
SM 338 Equipment Manual
(4) J31069-D401-U1-A0-7618
Communication malfunction
(detected by the module)
Time monitoring
(Watchdog has triggered a RESET.)
7 0
00000
Byte 2
Failure of internal module supply
voltage
(sensor supply +15 V/+24 V; inter-
face supply 5 V)
Time monitoring
The module i s equipped with a time monitoring function to check that the
firmware is functioning correctly. If program run time exceeds a certain time
frame, a RESET is triggere d on the module. The module then boots with the
default paramete rs and does not go into an undefined state.
EPROM error
(wrong checksum during test)
RAM error
7 0
000000
Byte 3
When a memory error occurs, the module ca n only be started agai n with a
RESET on the bus.
Data communica-
tion, program run
time and supply
voltage
Memory error
D
a
t
a
Communic
a
tion with the PLC