To send SMS messages from your cell phone you must:
Write and download SMS messages to the PLC as described in Creating SMS messages.
Write an SMS message in your cell phone.
Send the message to the controller s GSM modem
Note that you can only send messages that have already been set in the PLC. In addition, if a PLC is configured with the Limited to Authorized Phone Numbers option, you will not be able to send it SMS messages if your number is not in the list .
You write an SMS message using your cell phone keypad. Make sure that:
The fixed text in your cell phone is identical to the PLC's SMS message in every detail: spaces, characters--and note that characters are case-sensitive.
You bracket variable values with number signs (#) as shown below. These signs '#' do not count as spaces.
The variable field in the HMI Display is big enough to hold the value.
The figure below shows the same SMS message: as it appears on a cell phone display, and as it appears in the PLC's SMS Messages List.
When you send this message from your cell phone, the value 110 will be written into Variable 1 in the M90.
Enter the number of the PLC's GSM modem exactly as you would enter any GSM cell phone number, then send the message.
You can check if the PLC received your message by using the Acknowledge feature:
Select the ACK box as shown below.
Use your cell phone to send the message "Holding Temperature:#110#" to the PLC.
The PLC receives this SMS message.
The PLC immediately returns the message to your cell phone, together with the current variable value.
You can now view this SMS message on your cell phone display, together with changes in the variable value.
Although SMS messaging supports Integer and List variables, note that you cannot send List variables via cell phone.