Pilz PSS67 F 16DI SB-T - Manual (Page 17)

Operating Manual: PSS67 F 16DI SB-T 4 - 1
Function Description
Inputs
Single and dual-channel input devices can be connected to the inputs, with
or without test pulses. The inputs are equipped with input filters.
Input signals must show a “High” (“1” signal) of 15 VDC (+15 ... +30 VDC)
and a “Low” (“0” signal) of 0 VDC (-3 ... +5 VDC).
The input status is signalled to the CPU on the controlling PSS via
SafetyBUS p. Green LEDs indicate the status of the inputs. An LED lights
up as soon as a “1” signal is present at the input.
Diagnostic circuitry checks the function of the inputs and the input filter. If
an error is detected, all the outputs in the affected I/O-Group are shut down
and the I/O-Group switches to a STOP condition. The module then triggers
an error telegram on SafetyBUS p and stores the error in its error buffer.
Where test pulses are not used, inputs with single-channel input devices
can be used in applications up to and including Category 2 in accordance
with EN 954-1; in the case of dual-channel input devices, this extends to
Category 3 applications. The possibility of a short circuit occurring in the
external wiring between different inputs or against the supply must be
eliminated through appropriate wiring.
Test pulses must be used for applications with single-channel input
devices above Category 2 and for applications with dual-channel input
devices above Category 3.
Connection examples can be found in the chapter entitled: “Wiring the
Inputs and Test Pulse Outputs”.
The inputs can be assigned to two I/O-Groups. Please refer to the section
entitled “Setting the device address”.