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3.4
Reactions during Startup and in Case of Errors
Warm restart
Hot restart
Reaction to failure
of the S7-300
Module power
supply
CM35 Counter Module
(4) J31069-D0416-U001-A5-7618
When a warm restart (power on) takes place, the red group error LED (SF)
on the front of the module stays on until the module is ready for operation
(i.e., until it has received valid parameters).
When the module firmware recognizes the CPU STOP state, the parameters
stored on the CM35 lose their validity. Parameter memory and the input and
output area are deleted. This is indicated by the group error LED.
When the CPU assumes the STOP state, running operation of the CM35 is
terminated. The digital outputs are switched off (i.e., reset). Although the
operating mode is retained, the parameters are no longer valid.
Since the CM35 is completely powered by the backplane bus of the
SIMATIC S7-300, it has to be switched on together with the S7- - 300 CPU or
IM module.
Commissioning
3-23
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