Timing Diagram - Pilz PDP20 F 4 mag Operating Manual

PDP20 F 4 mag
Signal Output
There is a high signal at the signal output SO when the connected sensors are oper-
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ated (N/O contact closed).
If at least one of the sensors is not operated or is partially operated, the signal output
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SO will switch to a low signal.
Detection of shorts across contacts
2 test pulse outputs T0 and T1 enable shorts across contacts to be detected at the inputs.
The two test pulse outputs are permanently assigned to the inputs. If the test pulses are
swapped or there is a short circuit at the inputs, the device switches off the safety outputs
safely (low signal) and registers an error.
Series connection
The safety outputs of a PDP20 F 4 mag may be connected to the cascading inputs I40 - I41
on another PDP20 F 4 mag. 3 additional sensors may be AND-linked via this device. In the
event of a short across the contacts, the safety outputs will be switched off safely (low sig-
nal).
Input SI
The input SI is reserved for future functions and may not be used.

Timing diagram

POWER
Unit 1
I10...I41
Unit 1
O0/O1
Unit 2
I40-I41
Unit 2
I10...I31
Unit 2
O0/O1
t t
1
2
Legend
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Power: Supply voltage
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Unit 1, I10 ... I41: Input circuits of Unit 1
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Unit 1, O0/O1: Safety outputs of Unit 1
}
Unit 2, I40- I41: Cascading input of Unit 2
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Unit 2, I10 ... I31: Input circuits of Unit 2
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Operating Manual PDP20 F 4 mag
24737-EN-03
1
t t
3
2
: Single connection with Unit 1
: Series connection of Unit 1 and Unit 2
t t t t t t
1 3
1 2 2 3
2
t t t
t
2 1 3
2
8