Connecting the Inputs and Outputs
5-14 Installation Manual: PSS 3056 Series
Example: Dual-channel, failsafe input device, with test pulse
Features:
• This type of connection is mainly used for signal inputs with infrequent
operation.
• The operating system will detect all shorts between contacts and short
circuits to L+ and L-.
• Short circuits across the contact can be detected via the feasibility check
in the application program.
• The test pulse must be allocated to the input via the configurator on the
programming device.
• Only input devices with N/C contacts can be tested (in the case of diver-
se channels, only the N/C contact).
• On input devices with identical channels, each channel should be given
a separate signal, 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 signal to the input device and cable from the
input device to the input).
• If the input device has only one signal, a short circuit between the
cables from the input device to the inputs will not be detected. You
should always ensure that the unit is suitably wired to avoid the risk of
this type of short circuit.
• Cable runs:
- 200 m
- With 1 kOhm resistance parallel to input: max. 800 m
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