Wiring the Inputs and Test Pulse Outputs
7-8 Operating Manual: PSS SB 3006-3 Series
24 V DC
L+
L-
0 V
T 0
T 1
I 0.0
I 0.1
I 0.2
I 0.3
I 0.4
I 0.5
X1
Example: Dual-channel, failsafe input device, with test pulses
Features:
• This type of connection is mainly used for signal inputs with infrequent
operation.
• The test pulse must be allocated to the input via the configurator on the
programming device (see Programming Manual for the PSS-range).
• On input devices with identical channels, each channel should be given a
separate test pulse, where possible. This will ensure that all short circuits
are detected, with the exception of short circuits which short out the input
device (cable from the test pulse to the input device and cable from the
input device to the input).
• If the input device has only one test pulse, a short circuit between the
cables from the input device to the inputs will not be detected. In this
case the unit should be suitably wired to avoid the risk of this type of
short circuit. If diverse input devices are used, this type of error will be
detected.
Test pulse 0
Test pulse 1
Dual-channel input device
with diverse channels
Continued overleaf …
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