Fail-Safe Modules
7.6 EM 4 F-DI/3 F-DO DC24V PROFIsafe digital electronic module
ET 200S Distributed I/O System - Fail-Safe Modules
138
Installation and Operating Manual, 08/2008, A5E00103686-07
Magnetic capacitance with inductive loads
Note
Note that an inductive load connected to the DO channels can induce voltages in the case of
electromagnetic interference of a strong magnetic field. This can cause a short-circuit error
message.
Remedy:
•
Spatially disconnect the inductive loads or shield against the magnetic field.
•
Set the parameters for the readback time to 50 ms or higher.
SIL mode in grounded configuration
WARNING
The bridging resistance between the M-output and PE may not be less than 100 kΩ for
SIL2 operation in grounded configurations. The bridging impedance must be sufficiently
high for underflow of the relay release voltage, in order to maintain the proper functioning of
both shutdown circuits (P and M-switch).
(76)',)'2
/
0
5!N˖
0
3
3
3(
3VZLWFK
0VZLWFK
/RDG
Figure 7-33 SIL2 mode in grounded configuration
