ABB REF601 CEI - Page 8

1MDU07205-YN rev. F
REF601 CEI
User’s manual
8
Table of contents
Installation………..…….....………...……………65
Unpacking and inspecting the device..…………….....……65
Storage...................…..……………..………….………….…65
Checking environmental conditions and mounting space..66
Mounting the relay………………………………………….…66
Relay Wiring..............………………..….………………….…67
Relay mounting dimension..………..….………………….…67
Relay connection digram....................................................69
Bonding of sensor cable shield...........................................70
Relay ordering information...................……………......……73
Section 6
Serial communication.....................……………74
Modbus protocol overview...................……………......……74
Wiring......................…..……………..………….………….…74
Modbus RTU message format............................................75
Modbus RTU function codes..…………………………….…77
Exception response..………………..….………………….…84
Serial communication parameters....….………………….…87
Communication troubleshooting.........................................95
Section 7