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Function description
The table below shows which outputs signal the status of which safety function.
Output
STO Acknow-
ledge
SSA Safe Stand-
still Acknowledge
SDA Safe Direc-
tion Acknowledge
SRA Safe Range
Acknowledge
Ready
Signals at the output
}
"0"-signal (0 V) at the output:
–
–
–
}
"1"-signal (+24 V) at the output:
–
–
–
Supply voltage
}
24 VDC connection to supply the safety card's digital outputs
4.2.2.2
Output test
The outputs are tested regularly:
}
Outputs that are switched on are checked via regular off tests.
–
–
–
}
Outputs that are switched off are checked via regular on tests.
–
–
–
Testing for shorts
}
A test is regularly carried out to check for shorts between the outputs.
Operating Manual PMCprotego S2-2(-C)
1002529-EN-04
In-
No safety
ternal
function
error
activated
x
x
-
-
-
-
-
-
-
x
Output is high impedance
No current to the load
Safety function not activated
Output is low impedance
Current is supplied to the load
Safety function activated
Test pulses for outputs that are switched on: see technical details
Outputs that are switched on are switched off for the duration of the test pulse.
The load must not switch off because of the test.
Test pulses for outputs that are switched off: see technical details
Outputs that are switched off are switched on for the duration of the test pulse.
The load must not switch on because of the test.
SS1
SS2
SOS SLS
x
x
x
x
-
x
x
-
-
-
-
-
-
-
-
x
x
x
x
x
SSR
SDI
SLI
x
x
x
-
-
x
-
x
-
x
-
x
x
x
x
17
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