Oldham MX62, User Manual

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Page 70

System failure relay on CM

Relay outputs on the relay modules
Non-safety related outputs:

Visual indications (LED-, LCD- and logo module)

Analog outputs (AAM)

Relays for indication of emergency operation and service mode
The requirements for the safety related functions of WinPro

/ MX62 are result
of the safety plan of a safety related application. In addition existing legal or
official conditions have to be considered.
Example:
A relay output to control a visual alarm indication has in general lower safety
requirements then a relay output for an emergency shut down of a
manufacturing plant.
14.4. Configuration of WinPro / MX62
The EN 50402 requires a SIL capability for each safety related function of a gas
detection system. The SIL capabilities have to correspond with the safety
integrity level (SIL) of EN 61508.
The signal processing of WinPro

/ MX62 is designed following the
requirements of SIL 3 capability. The signal processing and the communication
between the signal inputs on the analog input modules via controller module to
the relay outputs are completely redundant.
The visual indications (e.g. LED and LCD module) are not part of the safety
chain. They are not considered in the SIL evaluations.
Applications with SIL 2 capability:
For each detection point one (1) detector is needed and for the safety related
function one (1) relay is used.
The signal processing inside WinPro

/ MX62 is redundant for increased
availability.
Applications with SIL 3 capability:
For each detection point two (2) redundant detectors are needed and for the
safety related function two (2) independent relays have to be used.
The signal processing inside WinPro

/ MX62 is completely redundant and SIL
3 capable.
14.4.1. Requirements for SIL 2 configurations

Connection of one (1) SIL 2 capable detector on an input of the AEM.