Siemens FDCIO223

Structure and function
31
Building Technologies
009122_e1_en_--
Fire Safety
2015-10-06
3.4.1.3 Connection of intrinsically safe detectors in ex-zone 1
Safety barrier SB3 can also be connected to the FDCIO223 input/output module.
This allows intrinsically safe detectors to be operated in ex-zone 1+2. If you
operate the module in conjunction with an SB3 safety barrier, the following points
must be observed in particular:
 The line resistance must not exceed 50 Ω (excluding the safety barrier
resistance).
 If a safety barrier is connected to both inputs/outputs, both barriers must be
connected to the same grounding point.
 An EOL22(Ex) must always be used as the end-of-line.
 Specific national requirements always apply when creating installations in areas
at risk of explosion.
NOTICE
Activated ground fault monitoring
Input/output module malfunction
 If you are using safety barrier SB3, deactivate ground fault monitoring on the
input/output module.
Circuit
Detector line circuit with intrinsically safe detectors in ex-zone 1+2
Notes
 Safety barrier SB3 is always required when connecting intrinsically safe ex
detectors for ex-zone 1+2.
 An EOL22(Ex) end-of-line must always be used to terminate detector lines in
ex-zone 1+2.
You will find more information in document 001204.