Network SEND and RECV instructions
C Series network communications
Written by Toby Kilroy
Updated at March 24th, 2023
C-Series PLCs have native communications protocols built in. There are two Instructions which are used for sending and receiving data between controllers. This can be via an Ethernet network, or over serial communications. However due to the many permutations in which these instructions can be used, some users do find it challenging to get working. In order to get started, we have provided a code sample below to show how these are used, with extensive documentation in the comments.
The program sample also show the correct use of the Logical Port flags in conjunction with this instruction. Please review this program in conjunction with the Instruction Reference Manual for your respective PLC CPU unit.
