HOKUYO AUTOMATIC UAM-05LP, User Manual

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Document No: C-61-00003-3
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3.7.1 Self-diagnostic function of OSSD
Self-diagnostic is a function to detect the malfunction in the output circuit by switching OFF the OSSD1
to OSSD4 for an interval of 300
μ
s. Therefore, safety-relay or power converter used must not response to this
diagnostic function. Figure 3-14 below shows the timing chart of the self diagnostic function of the OSSD
during dual protection mode.
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Figure 3-14 Timing chart of the OSSD’s self-diagnostic function
In single protection mode, self-diagnostic function is done for OSSD1 and OSSD2 signals only.
3.7.2 Lockout state
When an error is detected by the self-diagnostic function and UAM cannot operate normally it will
switch to lockout state. During the lockout state, OSSD1/2, OSSD3/4, WARNING1, WARNING2 will
switch to OFF-state. After removing the error, UAM can be reset by restoring the power to release from the
lockout state.
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When OSSD is at ON state, the signal is 24V and the signal is 0V during OFF state.
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OSSD is a safety related signal and should be connected directly to the relay or
device that switches the machine or vehicle under control.
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Sufficient time for the machine or vehicle must be allocated to stop when configuring
the response time of OSSD.
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Both the OSSD1 and OSSD2 outputs should be connected to the safety related
machines or control system. If OSSD3 and OSSD4 are used they must be connected
similarly.
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User must verify the configuration before actual operation.