Functions of the IM 151/CPU
5-22
ET 200S Interface Module IM 151/CPU
A5E00058783-01
5.10 Switching Power Modules Off and On During Operation
What Happens When Power Modules Are Switched Off During Operation
If the load power voltage to a power module is switched off during operation, the
following activities take place:
If you enable diagnostics during parameter assignment for the power module,
diagnostic interrupt OB 82 (diagnostic address of the power module) is called
with the corresponding diagnostic buffer entry (event 3942
H
).
The power module is entered as present but faulty in the system status list.
Switching off the load power supply has the following effects on the modules
supplied by the power module:
The modules can continue to be accessed without an I/O access error
occurring.
The outputs of the modules are deenergized and inactive for the process.
The inputs of digital modules and FM modules return 0; the inputs of analog
modules return 7FFF
H.
What Happens When Power Modules Are Switched On During Operation
If the load power supply to a power module is switched on during operation, the
following activities take place:
If you enable diagnostics when assigning parameters for the power module, the
diagnostic interrupt OB 82 (diagnostic address of the power module) is called
with the corresponding diagnostic buffer entry (event 3842
H
).
The power module is entered as present and o.k. in the system status list.
Switching on the load power supply has the following effects on modules supplied
by the power module:
The modules regain their full functionality.
Removal and Insertion of Power Modules During Operation
You can find a list of activities that occur if you remove or insert power modules
during operation in Section 5.9.
Removal and insertion has the same effects as switching the load power supply off
and on for the modules that are supplied by the power module.
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