Pilz PSS67 F 16DI SB-T - Manual (Page 37)

Operating Manual: PSS67 F 16DI SB-T 7-11
Example: Dual-channel, failsafe input device, with test pulse
Features:
• Depending on the application area and its respective regulations, this
connection diagram is suitable for applications up to Category 4 in
accordance with EN 954-1.
• This type of connection is mainly used for signal inputs with infrequent
operation.
• 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.