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ifm Programming Manual ecomatmobile BasicController (CR0403) Runtime System V03.02 2015-04-01
System description Hardware description
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Reaction of the outputs to overload or short circuit
15251
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Self-protection of the output
15253
The hardware protects itself, irrespective of the operating mode of the output and of the fault
detection. In case of a too high thermal load (caused by short circuit or overload), the output driver
begins to clock.
The driver may be damaged in case of too long clocking of the output (several hours).
We therefore recommend:
that you operate device outputs with diagnostic capabilities in the following mode, since, in this case,
the software protects the drivers additionally by switching off:
• FB OUTPUT (→ page 180) > input MODE = 16
This is also the default setting if only the flags in the control configuration are used.
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Reaction according to the operating mode of the output
15252
In case of an overload or a short circuit, the behaviour of the output depends on its operating mode
(→ FB OUTPUT (→ page 180) > input MODE):
• MODE=2: binary output plus switched: no diagnosis and no protection
> the output continues to be operated.
• MODE=15: binary output plus switched with diagnosis
> error is detected and signalled on the output RESULT by the FB OUTPUT:
e.g.: RESULT = 128, 141, 142 or 145.
This depends on the type of output and the current or voltage at the output.
The programmer can react to the error in the program.
• MODE=16: binary output plus switched with diagnosis and protection
> error is detected and signalled on the output RESULT by the FB OUTPUT.
> The respective output is switched off.
> The logic state of the output remains unaffected by this!
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Reaction when using PWM or CURRENT_CONTROL
15254
The situation is different when the FBs PWM or CURRENT_CONTROL are used:
There is no diagnosis. The →self-protection of the output becomes active.
► For outputs with current feedback:
Query the typical current for the output in the application program!
It is the responsibility of the programmer to react to the event.
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