Fail-Safe Modules
7.8 1 F-RO DC24V/AC24..230V/5A Digital Electronic Module
ET 200S Distributed I/O System - Fail-Safe Modules
184 Installation and Operating Manual, 08/2008, A5E00103686-07
If the 24 VDC control voltage falls below the required value for relay pick-up or the wire to
the input connections breaks, the relays will be released and "0" will be read back instead of
"1." This fault is only detected if the control voltage is switched on.
The value "1" is read back from the module if one of the two relays gets stuck (NO contacts
remain closed). The fault is detected by comparing this readback value with the expected
value "0" in the safety program. This fault is only detected if the control voltage is switched
off.
Note
SIL3/Category 4/PLe requires the readback of process states and at least daily signal
transitions.
7.8.4 Diagnostic functions of EM 1 F-RO DC24V/AC24..230V/5A
Output status display
Behavior of the output status display at the F-RO module:
● Relay not activated: LED is not lit
● Relay is activated: LED is lit
● Relay not activated and relay contact welded: LED is lit
Causes of Faults and Corrective Measures
In S7 Distributed Safety F-systems you can run diagnostics by evaluating output "DIAG" of
FB 216 "F_FDBACK" when using this F-application block in your safety program to read
back the relay contacts (refer to the
S7 Distributed Safety, Configuring and Programming
manual).
7.8.5 Technical specifications of the EM 1 F-RO DC24V/AC24..230V/5A
Overview
Technical Specifications
Dimensions and Weight
Dimensions W x H x D (mm) 30 x 81 x 52
Weight Approx. 90 g
Data for Specific Module
Number of outputs
• Relay outputs
1 (2 channels)
Assigned address area
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