Mitsubishi Electric MR-D30 Instruction Manual page 85

4. SAFETY OBSERVATION FUNCTION
(c) Parameter setting
For the pins to which input devices are assigned with [Pr. PSD02 Input device selection DI1] to [Pr.
PSD07 Input device selection DI6] , set whether or not to execute the fixing-diagnosis at start-up with
[Pr. PSD27 Input device - Fixing-diagnosis execution selection 1 at start-up] and [Pr. PSD28 Input
device - Fixing-diagnosis execution selection 2 at start-up].
The achievable safety level will depend on the settings of [Pr. PSD27] and [Pr. PSD28]. Refer to
section 4.1 for details.
(5) Diagnosis with test pulses
(a) When connecting a device which does not have a diagnosis function (such as switch)
The external wirings can be diagnosed by using the pulse signals outputted from PLSA and PLSB.
Refer to section 3.3, and check that the wiring is properly connected to execute the test pulse
diagnosis.
The following shows the operation sequence to execute the test pulse diagnosis by the switch
connected to DI1A and DI1B. The off-pulses are outputted from PLSA/PLSB periodically. PLSA and
PLSB output the off-pulses at different timing, not the same time. The width of off-pulses can be set
with [Pr. PSD26 Input device test pulse off time]. Set the parameter so that external devices such as
switches are affected by the output pulses.
PLSA
PLSB
Switch
DI1A
DI1B
[AL. 79.5 Input device error] occurs when an error is detected by the test pulse diagnosis.
Whether or not the test pulse diagnosis is executed to each input device can be set with [Pr. PSD24
Input device - Test pulse diagnosis execution selection 1] and [Pr. PSD25 Input device - Test pulse
diagnosis execution selection 2].
(b) When connecting a device which has a diagnosis function (such as safety controller)
To diagnose external wiring, use diagnosis function of the device. The test pulse diagnosis of MR-
D30 cannot be used. Set the relevant device settings to "0" (not diagnose) with [Pr. PSD24 Input
device - Test pulse diagnosis execution selection 1] and [Pr. PSD25 Input device - Test pulse
diagnosis execution selection 2].
ON
OFF
ON
OFF
Closed
Opened
ON
OFF
ON
OFF
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Input device - Test pulse off time
Input device - Test pulse off time