Basic Features

CMGSM is the communication module for FATEK PLC systems using GSM network to transfer the data. TC-65 JAVA OPEN CODE SIEMENS quarto band GSM module 850/900/1800/1900 MHz  and internal Li-Ion battery are used. With the same HW, there are three different ways of operation available.

The first one is monitoring and remote control by SMS. CMGSM reads periodically PLC registers containing a flag to send SMS, if the flag is set, CMGSM reads destination phone number and string of characters (text), sends SMS and clears the flag. If there is a SMS received by CMGSM, it is written into PLC registers including another flag “SMS received” to be processed by PLC program. At the end the PLC program clears this flag. So these operational SMS must be processed by PLC program both on SMS reception and SMS sending. Some status and event SMS are predefined in CMGSM (eg. “PLC power OFF”) and only the destination phone number must be set in PLC registers.

The second way of communication with PLC via CMGSM is dial up data transfer via GSM network (CSD). The connection can be only incoming for CMGSM, that might be initiated from a control center for the purpose of remote system analysis and PLC software tuning and modification by Winproladder SW. During time of CSD operation all other operations of CMGSM are suspended.

The third way of CMGSM communication over GSM network is GPRS data connection using TCP/IP protocol.  CMGSM opens the connection in TCP client mode. Any SIM card, that can provide internet connection over GSM network, can be used. CMGSM connects to IP address and port specified either from PLC or from a special SMS. It is important to notice, that the connection can be opened in direction from CMGSM to PC (server) only. PC cannot open a connection to CMGSM, because it does not have public IP address. The connection command can be SMS with fixed IP address where to connect. Simple SMS command “Connect” or  voice or data ringing to CMGSM phone number will cause, that CMGSM will read destination IP address from PLC registers and will make TCP/IP connection there. GPRS has the same data transfer properties (data grouping, data transfer delay 1..10 seconds), that are not suitable for Winprolad SW. Winproladder must use dial up data transfer – CSD only.


Highlights

• Three ways of GSM net use – SMS, GPRS, Data Call
• WinProladder remote GSM dial up data transfer connection
• USB port for module monitoring and fw update
• Li-Ion backup battery – min. 24 hours of operation
• Mechanical switch to disconnect and connect the battery
• Lowest level super watchdog function (HW PWR OFF)
• Can be used directly with FBs-xxMC (Port 3)
• SMS functionality is fully under PLC program control
• No PLC program support needed for CSD and GPRS operation except setting some PLC registers
• LEDs for device status and data flow signalization
• One CMGSM can work for network of PLC units, inputs and outputs can be placed at different places
• Unlimited number of  logical and analog inputs and outputs can work with one CMGSM (PLC network)

Typical use

• All FATEK FBs control systems that should be monitored or remote controlled via GSM net
• For GSM monitoring and remote control with high number logical or analog inputs/outputs
• For GSM monitoring and remote control if inputs and outputs are spread in large space using PLC network

Specification