YASKAWA MP3000 Series - Using IO Message Communications with the MP3000 as the Master

2.9 Communications with a KOYO PLC (MODBUS/TCP Protocol)
Using I/O Message Communications with the MP3000 as the Master
2-257
Ethernet Communications
Using I/O Message Communications with the MP3000 as the
Master
This section describes how to communicate with a KOYO PLC by using I/O message communications.
Note: 1. I/O message communications use 1-to-1 communications.
2. When using the MODBUS/TCP protocol to communicate with a KOYO DL-series PLC, you can only read and
write holding registers.
3. When communicating with multiple remote devices or when you need to perform any operations other than
reading and writing to holding registers, such as reading the states of coils and input relays, and changing the
states of coils, use the Send Message function (MSG-SNDE).
EthernetEthernet
MP3000
218IFD
TCP
Binary
MP3000
(local station)
KOYO DL-series PLC
(remote station)
Master
Communications Protocol
Connection Type
Data Code
Slave
I/O message communications
(no ladder programming)
DL-series PLC
MODBUS/TCP protocol
MODBUS/TCP