Wiring the Inputs and Outputs
7-8 Operating Manual: PSS 3075-3 Series
Example: Dual-channel, failsafe input devices, without test pulses
Features:
• Depending on the application area and its respective regulations, this
connection diagram is suitable for input devices with frequent operation
and diverse channels, up to category 4 in accordance with EN 954-1,
provided the functionality of both input device channels is monitored in
the user program via a feasibility check.
• Depending on the application area and its respective regulations, this
connection diagram is suitable for input devices with infrequent
operation up to category 3 in accordance with EN 954-1, provided the
functionality of both input device channels is monitored in the user pro-
gram via a feasibility check.
• The possibility of a short circuit occurring between adjacent terminals
cannot be eliminated. For this reason, the two identical (homogenous)
channels on an input device must not be connected to adjacent inputs.
• If you are using input devices with different (diverse) channels, adjacent
inputs may be used. Short circuits will be detected in the user program
via the feasibility check.
CAUTION!
A short circuit in the cable between the input device and input with the L+
line or between adjacent inputs will not be detected. Depending on the
type of input device connected, this could create a risk to both personnel
and machinery (e.g. E-STOP). Always ensure that the unit is suitably wired
to eliminate the risk of short circuits.
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