ABB ACS800 Firmware Manual page 95

The following figure illustrates data transmission in a Master/Follower application.
Note: Only the ring topology is supported.
T = Transmitter; R = Receiver; RMIO = I/O and Control Board
Please note that channels CH0/CH2/CH3 are located on the optional RDCO-0x board.
Master
*) ACS800
RMIO-XX
RDCO-0X
CH2
T R
*) External 24 V to the RMIO board, support fast start-up and avoid communication error between
drives.
For more information on the requirements for a redundant crane control application
between Master, Followers and spare units, see section
Follower crane control
Data set 41 is used for transmission of data from Master to Follower as follows. Data
set 41 is updated on 6 ms.
• If the Master is in EXT2 and parameter
signal 03.11 FOLLOWER MCW is transferred using data set word 41.1. Signal
02.02 SPEED REF 3 is transferred using data set word 41.2 and signal
TORQ USED REF is transferred using data set word 41.3
• If the Master is in EXT2 and parameter
parameter 78.01 SYNCHRO CONTROL is ON, then signal
WITH POS is transferred using data set word 41.1. Signal
is transferred using data set word 41.2 and signal
transferred using data set word 41.3.
• If the Master is in EXT2 and parameter
parameter 78.01 SYNCHRO CONTROL is OFF, then signal
MCW is transferred using data set word 41.1. Signal
transferred using data set word 41.2 and signal
transferred using data set word 41.3.
Follower
*)
CH2
T R
on page 304.
60.11
60.11
60.11
ACS800 *)
RMIO-XX
RDCO-0X
CH2
T R
Redundancy in Master/
SLAVE MODE is TORQUE, then
SLAVE MODE is SPEED and
03.37
03.38
02.02 SPEED REF 3 is
SLAVE MODE is SPEED and
03.11
02.02 SPEED REF 3 is
02.02 SPEED REF 3 is
95
Follower
ACS800
RMIOXX
RDCO-0X
02.13
FLW CMD
POSITION REM
FOLLOWER
Program features