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MODEM MD720 in OPC Mode
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5.1
OPC Mode activation
Terminal mode is factory default setting
The MODEM MD720 supports two fundamental operating modes:
● Terminal mode
● OPC Mode.
The MODEM MD720 will be delivered by the factory with activated Terminal Mode.
Automatic activation by the PLC
Operating the MODEM MD720 in OPC Mode combined with S7-200 devices, the
OPC Mode will be activated by the program building blocks automatically during
the initialization.
Manual activation
If in exceptional cases a manual activation of the OPC Mode is necessary, you will
find instructions in chapter 6.1
Switching between Terminal mode and OPC Mode
5.2
Operating requirements in OPC Mode: GPRS subscriber
contract
To use the MODEM MD720 in OPC Mode it is required:
SIM card of a GSM network operator with activated GPRS,
SIM card of a GSM network operator including CSD data service 9600 Bit/s
and an extra telephone number for data calls (to make Teleservice),
Availability of a GSM network