Mitsubishi MELSEC-WS series, User Manual

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Chapter 3
37
Product description
3.8.4 Disabling the test pulses of WS0-XTIO outputs Q1 to Q4
It is possible to disable the test pulses on one or several outputs of WS0-XTIO
modules with firmware version V2.00.0 and higher.
Disabling the test pulses of any output reduces the safety parameters of all
outputs!
Disabling the test pulses of one or more outputs of an WS0-XTIO module will reduce
the parameters for all outputs Q1
to Q4 of this module. Consider this to ensure that
your application conforms to an appropriate risk analysis and avoidance strategy!
For detailed information on the safety parameters see chapter 12.
Use protected or separate cabling!
If you disable the test pulses of one or more outputs Q1 to Q4, you have to use
protected or separate cabling for the outputs with disabled test pulses, because a
short circuit to 24 V can not be detected if the output is High. This could inhibit the
switch-off capability for the other outputs in case of an internal detected hardware
failure due to reverse powering.
Perform cyclic tests if the test pulses of any safety output are disabled!
If you disable the test pulses of one or more safe outputs Q1 to Q4, at least once per
year either all outputs without test pulses have to be switched off at the same time for
at least one second as a result of the logic program of the CPU module. Alternatively a
power reset of the safety controller has to be performed.
How to disable the test pulses of an XTIO output Q1 to Q4:

Connect an output element to the WS0-XTIO module.
 Double-click the output element using the left mouse button.
 Deactivate the option Enable test pulses of this output . The test pulses of this
output are switched off. A notice will be displayed in the hardware configuration
area under the respective WS0-XTIO module.
ATTENTION