Digital Input Module Ep-1922 - GE RSTi-EP Functional Safety Manual

Chapter 7. Detailed Descriptions of EP-19xx Modules

5.5 Digital Input Module EP-1922

EP-1922 EP-1922
Safe Power-feed Module EP-1922 Connection Diagram EP-1922
The power-feed module EP-1922 enables the safe feed-in for the output current path. The module
ensures that two emergency stop circuits can be monitored, and using the OSSD output they can be
forwarded to a PLC or also cascaded to a further RSTi-EP station. The switch-off delay can be set
using DIP switches. The undelayed status is displayed with the SS1 output. Almost all types of output
modules will be safely switched-off (SIL3/Ple/Cat. 4) when they are placed within the safety segment
(refer to the section, General Contact Information).
For restarting, either the manual or the auto input can be switched. In any case, the system must be
reset by pressing the manual reset within 0.1 to 2 s after setting the supply voltage.
The evaluationof test pulses in the safety circuits provides the detection of faults or manipulations of
the wiring. Therefore, every second a low pulse of 1 ms is being generated in each circuit, these
pulses are phase-shifted. The evaluation of the test pulses can be activated or deactivated by setting
DIP-switches.
The connections Safety Input 0 (S 11, S 21), Safety Input 1 (S 31, S 41), Man Start 1 and Autostart 1 are
digital inputs Type 3 according to EN 61131-2. The Man Start 1 input can also be controlled by a
standard PLC output.
Safety sensors with OSSD outputs or standard PLC outputs can be connected if the safety inputs are
used in mode "no test pulses". In this case another safety review is obligatory. The auxiliary outputs S
12, S 22, S 32, S 42, Man Start 2 and Autostart 2 must only be used for refeeding the allocated inputs.
In the case that several EP-19xx modules are used in cascades please regard that the triggering of a
EP-19xx module will switch off the power supply of all subsequent power-feed modules. A delay of
these modules is no longer effective.
32 RSTi-EP Functional Safety Manual GFK-2956A