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4. SAFETY OBSERVATION FUNCTION
(c) Parameter setting
Set for pins to which input devices are assigned with [Pr. PSD02 Input device selection DI1] to [Pr.
PSD07 Input device selection DI6] and set whether execute the fixing-diagnosis at start-up or not
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 be affected by 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 pulse signal outputted from PLSA/PLSB. Refer to
section 3.3 and check if the wiring is possible 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/PLSB outputs off-pulses at different timing, they will not output the off-pulses at the same time.
The width of off-pulses can be set with [Pr. PSD26 Input device test pulse off time]. Set it so that
external devices such as switches etc. do not get affected by 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 each input device to execute the test pulse diagnosis or not 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 wirings, 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
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