Operating Manual: PSS SB 3006-3 Series
4-3
Digital inputs (DI2)
All programmable safety systems in the PSS SB2 3006-3 series have six
integral on-board inputs, which are suitable for connecting single and dual-
channel input devices, with or without test pulses. Input signals must show
a “High” (“1” signal) of 24 VDC (+15 ... +30 VDC) and a “Low” (“0” signal)
of 0 VDC (-3 ... +5 VDC).
LEDs are used as status indicators. An LED lights up as soon as a “1”
signal is present at the input. All inputs have input filters.
Internal diagnostic circuitry checks the function of the inputs, including the
input filter. If an error occurs, the PSS will switch to a STOP condition and
output a message to the CPU display. In addition, all the decentralised
outputs in the I/O-Groups assigned to the PSS Logic Device will be
switched off (see also “SafetyBUS p System Description”).
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 device should be suitably wired to eliminate
the risk of a short circuit in the external wiring between the different inputs
and also between the PSS supply and any bus interface.
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 Chapter 7
of this manual, “Wiring the Inputs and Test Pulse Outputs”.
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