Documentation

Send SMS

Sending SMS - ST

Block name

SENDSMS

ST call

PROGRAM TEST_SENDSMS
 VAR
    	TESTSMS:BOOL:=TRUE;

	CHANNEL : STRING[64] := 'ALRCHANNEL'; 
    	RECIPIENT : STRING[64] := '00420123456789';   
    	MESSAGE : STRING[64]; 

 END_VAR
    
 IF TESTSMS THEN
 	MESSAGE := 'TEST SMS HAS BEEN SENT.';
 	MESSAGING.SENDSMS(CHANNEL,RECIPIENT,MESSAGE);
        TESTSMS := FALSE;
 END_IF;

END_PROGRAM

Library

MESSAGING

Version

V1.0

Description

The function sends a SMS in each PLC computing cycle. It is highly recommended to be used in ST code only to prevent occassional flooding of the recipient with many messages of the same contents. If You want to send more than one message at the time, You have to use this block multiple times or create some sort of switcher for recepients. Every GSM gate has it's queue lemit, for example limit of four messages. We highly recommend to send the messages with some breaks, for example pause between two messages can be 10 seconds.  Messages that  can't be handeled by the queue are forgotten.

Inputs

Outputs

Function

At each of the sendsms function calls, a SMS is sent from the predefined GSM modem to the recipient phone number. The SMS contents is taken from the message variable.

The channel variable refers to the predefined communication channel. This has to be created in the PLC properties: doubleclick the PLC and select Message definition, then right-click the context menu and Add alarm channel.

Now, define the channel name which is the value of the channel variable. Then, the GSM connection type must be defined: click to select the channel and set the port to communicate to the modem in the channel properties. Set the channel communication properties. If the SIM card is secured by a PIN, enter the PIN here. Finally, confirm all changes by clicking OK in the red dialogue.

If some of the predefined modem types is used, like Siemens TC-35 chipset, or Wavecom, it is possible to set in the AT command settings predefined commands to set up the modem. Then click the Apply button. The necessary AT commands are then added to the table. Click the Close button and confirm by clicking OK in the red dialogue. If another modem type is used, the AT command sequence has to be entered manually. (In case of unsupported modem types please contact the Domat Control System technical support.)

The output variable result indicates the result of the system settings check.

Application example

The function is typically used to send alarm messages or regular reports with energy consumption, environmental parameters etc. See ST call above for function call