M-Controller II System Operation Manual - 4 -
84350-201-001 Rev C
2 General System Overview
QEL’s M-Series gas monitoring system is a set of remote sensors and relay control
modules tied together and controlled by the M-Controller. QEL sensor/transmitters
comprise a group of remote mountable sensors complete with electronics, most of which
have both analog and digital communications, and most of which have display and
onboard relay options.
The M-Controller is a flexible programmable controller with capability to work with up
to 32 QEL digital sensor/transmitters and up to 8 analog (4-20 milliamps) linear input
signals for a total of 40 sensors. With three on-board relays, the controller can also direct
up to 12 remote relay modules (M-Relay, M-Annunciator etc.), each of which may have
up to 8 relays. With the same RS-485 interface, the controller can also communicate with
Remote Annunciator Panel (M-Annunciator and QRP) that are devices, located at some
distance from the M-Controller and provides a user an audible and visual indication of
the status of the M-Controller. The M-Controller also equips a USB port to allow
traditional Windows PC software, M-View, to access the M-Controller config database.
Additional RS-485 port can be programmed through Menu to either work as a Modbus
RTU port for BAS or SCADA (as default) or work as a BACnet port to connect QEL
BAC-Box, which supports BACnet/IP protocol.
Additional features include relay outputs for strobe light and horn as well as an on-board
buzzer. Two channels switch inputs are programmable to trigger any relays, buzzer, or
any channel of Analog output.
The power supply is designed for 24VAC or 24VDC input power. QEL can supply a
transformer for external mounting sized to the application if requested.
NOTE:
WHEN PROGRAMMING THE M-CONTROLLER WITH A LAPTOP THROUGH USB
PORT ENSURE THAT THE LAPTOP IS NOT CONNECTED TO ANY POWER
SOURCE. FAILURE TO FOLLOW THESE INSTRUCTIONS COULD RESULT WITH
DAMAGES TO THE CONTROLLER AND OTHER DEVICES CONNECTED TO IT.
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