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Function overview
2.4
Teleservice via PC
A Mitsubishi Alarm Modem can be used to handle the remote maintenance of
several controllers via a telephone line. This is usually possible with the program-
ming software in use. The variables and I/O ports of the PLC can also be read or
written remotely online with the Mitsubishi Alarm Editor (MX-AME). The entire
configuration of the Mitsubishi Alarm Modem can be carried out by remote dial-in
and the logged data can be read "manually".
Secure Login
Optimum security is ensured since unauthorized dial-in attempts are prevented by means of a
login procedure with user name and password. All dial-in and dial-in attempts are recorded.
2.5
Pump alarm application example
The following example shows how you can use the wide range of functions of the Mitsubishi
Alarm Modem to handle complex tasks automatically:
Pump alarm:
Send an e-mail, a fax and an SMS to three different destinations
if input X0 on the PLC closes.
Wait ten minutes for a confirmation via SMS.
Service technicians can query status values by SMS (or dial-in and PC).
Wait for a switch command for reserve pump 2.
If the SMS confirmation does not come within 10 minutes,
start a new alarm message cascade to other recipients.
If the switch command for switching on the reserve pump has been received,
switch on the PLC output Y10 (or a relay).
2.6
Model And Equipment Versions
The Mitsubishi Alarm Modems were offered in two equipment versions: GM series (Alarm
Modem GSM) and AM series (Alarm Modem 56k ). The basic functions within these series are
identical.
Mitsubishi Alarm Modems for GSM (GM)
Interfaces
COM1
COM2
Tab. 2-1
Mitsubishi Alarm Modems 56k for the analog telephone line (AM)
Interfaces
COM1
COM2
Tab. 2-2
Mitsubishi Alarm Modem
MAM-GM6
RS232
—
Interfaces of the GM series
MAM-AM6
RS232
—
Interfaces of the AM series
Teleservice via PC
MAM-GM20
RS232
RS232
MAM-AM20
RS232
RS232
MAM-GM24
RS232
RS485/422
MAM-AM24
RS232
RS485/422
2 - 2
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