Industrial Control Summary : This solution focuses on a PLC-based SMS control scheme. The PLC is connected to the GRM200 SMS alarm controller developed by Guangzhou Jukong Technology, enabling the control system to achieve remote SMS control, remote SMS alarms, remote payment reminders, and remote maintenance.
Connection method
The PLC and GRM200 are connected via a 485 bus, with the GRM200 acting as the communication master and the PLC as the communication slave. The GRM200 supports communication protocols including MODBUS , Siemens S7-200 (PPI protocol), Mitsubishi, and Omron protocols.
By inserting a SIM card into the GRM200, you can receive text messages sent by on-duty personnel or send text messages to on-duty personnel proactively.
The GRM200 can use mobile, Unicom, and Telecom SIM cards. As long as there is a mobile signal, the on-duty personnel can control the operation of the equipment and obtain information about its operation at any time.
This solution focuses on a PLC-based SMS control scheme. The PLC is connected to the GRM200 SMS alarm controller developed by Guangzhou Jukong Technology, enabling the control system to achieve remote SMS control, remote SMS alarms, remote payment reminders, and remote maintenance.
Connection method
The PLC and GRM200 are connected via a 485 bus, with the GRM200 acting as the communication master and the PLC as the communication slave. The GRM200 supports communication protocols including MODBUS , Siemens S7-200 (PPI protocol), Mitsubishi, and Omron protocols.
By inserting a SIM card into the GRM200, you can receive text messages sent by on-duty personnel or send text messages to on-duty personnel proactively.
The GRM200 can use mobile, Unicom, and Telecom SIM cards. As long as there is a mobile signal, the on-duty personnel can control the operation of the equipment and obtain information about its operation at any time.
Implementation principle and examples:
1. The user sends a text message to the GRM200 SMS controller via their mobile phone, such as "Set temperature = 23".
2. After receiving the SMS message, GRM200 modifies the value of the PLC register through the communication interface and sends it to the PLC.
3. The PLC controls the equipment based on the new set temperature.
4. After successful setup, the GRM200 will send an SMS to the user: "Temperature set to 23 degrees Celsius, successful execution ! "
Remote SMS Alarm
When the equipment malfunctions, the GRM200 will proactively send an alarm SMS to the mobile phone of the on-duty personnel, enabling unattended operation.
Multiple mobile phones can be configured for on-duty personnel. The GRM200 can dial first and then send an SMS to remind the on-duty personnel.
For high-priority alarms, the GRM200 can request the customer to send a confirmation SMS; otherwise, it will periodically call the on-duty personnel's mobile phone and repeatedly send the alarm SMS.
Implementation principle and examples:
1. Configure alarm thresholds for GRM, such as a current threshold of 50A.
2. GRM reads the measured current threshold value of the connected PLC.
3. If the GRM200 determines that the measured current value exceeds the configured threshold, it will send an alarm SMS to the on-duty personnel.
4. The GRM200 can also read fault flags from the PLC, trigger alarm SMS messages, and send them to the on-duty personnel.
Remote SMS Inquiry
The GRM200 periodically sends device information to the on-duty personnel's mobile phones, such as sending the device's current every hour.
On-duty personnel can proactively send text messages to GRM200 to inquire about the current equipment information.
Implementation principle and examples:
1. The GRM200 reads the register information of the connected PLC, such as the current measured current value.
2. When the scheduled time arrives, the GRM200 sends the equipment's current value to the on-duty personnel.
3. If the GRM200 receives a query command from the on-duty personnel, it will send the current current value to the on-duty personnel.
