1 Task
Monitoring of 24 V load circuits
Entry-ID: 61450284, V1.1, 05/2014
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Description of the automation task
Using the PSE200U module enables monitoring up to four 24 V load circuits
electronically for overload or short-circuit.
The PSE200U module is connected to a controlled 24 V power supply with up to
40 A output current, e.g. a 24 V power supply by SITOP. The PSE200U module
divides the controlled output voltage (24 V DC) between four load circuits. The
24 V load circuits are connected to the outputs OUT 1 to OUT 4 and monitored by
the electronic system of the PSE200U module. Load 1 is located in the 24 V load
circuit of output OUT 1.
The module detects, for example, if an overload or a short-circuit occurs in a load
circuit. In the case of an overload or short-circuit, the appropriate outputs OUT 1 to
OUT 4 are automatically switched off.
The state output (S) of the PSE200U module supplies a signal that serially codes
the state of the outputs OUT 1 to OUT 4.
The following tasks must be solved in order for the status of the individual channels
to be evaluated by the SIMATIC S7-300 CPU and displayed by the SIMATIC
Panel:
Reading the signal of the status output (S) of an S7-CPU.
Evaluating the signal course of the status output (S) in the user program of the
SIMATIC S7-300 CPU, in order to save the states of outputs OUT 1 to OUT 4
of the PSE200U module in the SIMATIC S7-300 CPU and provide it for the
SIMATIC Panel. The S7-CPU must generate all massages on the state of
outputs OUT 1 to OUT 4 for the SIMATIC Panel.
Resetting the message and the PSE200U module at the SIMATIC Panel via
remote reset.
