Mitsubishi Electric MR-D30 Instruction Manual page 90

4. SAFETY OBSERVATION FUNCTION
(3) Diagnosis with test pulses
(a) Test pulse diagnosis function
This function diagnoses the wiring by periodically outputting the off-pulses when DO1_ to DO4_ are
on.
The following shows the operation sequence for when STOS (STO output) is assigned to DO1_. The
off-pulses are outputted to DO1A and DO1B periodically when STOS (STO output) is on. DO1A and
DO1B output the off-pulses at different timing, not the same time. The width of off-pulses can be set
with [Pr. PSD30 Output device - Test pulse off time]. Set the parameter so that external devices are
not affected by the outputted off-pulses.
STOS (STO output)
DO1A
DO1B
[AL. 79.6 Output device error] occurs when an error is detected by the test pulse diagnosis. Whether
or not the test pulse diagnosis is executed to each output device can be set with [Pr. PSD29 Output
device - Test pulse execution selection].
(b) Parameter setting
For the output device that is assigned by [Pr. PSD08 Output device selection DO1] to [Pr. PSD11
Output device selection DO4], set the following parameters.
Set whether or not to execute the test pulse diagnosis to each output device with [Pr. PSD29 Output
device - Test pulse execution selection]. Set the off-time of test pulses outputted from the output
devices to [Pr. PSD30 Output device - Test pulse off time].
The achievable safety level depends on the device you use and parameter settings of this function.
Refer to section 4.1 for details.
ON
OFF
ON
OFF
ON
OFF
Parameter
PSD29 Output device - Test pulse execution selection
PSD30 Output device - Test pulse off time
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Output device - Test pulse off time
Output device - Test pulse off time
Name