Digital Input Module Ep-1902 - GE RSTi-EP Functional Safety Manual

Chapter 7. Detailed Descriptions of EP-19xx Modules

5.4 Digital Input Module EP-1902

EP-1902 EP-1902
Safe Power-feed Module EP-1902 Connection Diagram EP-1902
The power-feed module EP-1902 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. 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 seconds after setting the supply voltage.
The evaluation of 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 ulses
are phase-shifted.
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
tandard PLC output.
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.
The maximum feed-in current in the output current path is 8 A. The module is sending a pulse (< 1
ms) every 100 ms.
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