ADC MDM-TEL
Modem
Document
MDM-TEL Application Note.doc
Page 16 of 16
16
Last reviewed: 03/07/2002
Local
Modem
IBM Compatible
Remote
Modem
PLC
PLC Network Instructions
The PLC code used is very simple. The example shown below was written for a 250 PLC. The
code will differ slightly depending upon the CPU you are using, the information you are requesting
and the remote PLC with which you are communicating. You should write the code and setup the
communication port is the same manner that you would for a direct connection between the
PLCs. You should always test the PLC communications with a direct connection before you
attempt to place the modems in between. Should you encounter difficulties, this will help
immensely in troubleshooting. Refer the user manual of the PLC you are using in Chapter 4 for
help with the ladder setup for networking Direct Logic PLCs together.
