MM-IM User Guide
9
The MM-IM
Introduction
The Intelligent Modem is one of the MM4 family of RTU’s based on the Micro Medina
kernel, a proven solution providing feature-rich telemetry functionality including standard
I/O monitoring and control, monitoring of events and alarms, rate of change monitoring
and local data logging and trending. Additional features such as the provision of
independent lower and upper alarm thresholds and time deadbands can be used to reduce
the false alarm rate. The MM-IM has been designed to take advantage of mainstream PC
technology to reduce costs and allow for easy expansion.
MM-IM functionality
The MM-IM is fully functional when supplied, with software (the ‘firmware’) pre-installed.
This functionality includes:
■ Storing of historic values (‘trending’)
■ Alarm and event generation
■ Support for distributed IO protocols such as DF1 Master, Modbus master & slave and
EtherNet/IP
■ IEC61131-3 compliant program language for specific control and automation tasks
■ Support for over 4,000 IO points
■ A range of communication options: Serial, Radio, PSTN, GSM, GPRS and IP
The MM-IM may be upgraded to take advantage of new releases of firmware. The
firmware is downloaded to the MM-IM over its Ethernet interface using a PC.
The RTU’s configuration is maintained during firmware upgrade (although of course the
user can change the configuration if required). Note that it may sometimes be necessary
to also load the device configuration – either because the existing configuration has been
corrupted during the firmware upgrade procedure or because the existing configuration is
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