ABB ACS 800 Series, Firmware Manual

Page: 256 / 340

Fieldbus control
256
Fieldbus references in a Master/Follower configuration
When the ABB Drives communication profile is active, the fieldbus interface uses the
following references in the Master drive:
• When the Master is in control location EXT1 (stand-alone, speed-controlled), the
fieldbus interface uses REF1 for the speed reference.
• When the Master is in control location EXT2 (Master/Follower, either speed-
controlled or torque-controlled depending on the selection of Par. 60.02 TORQUE
SELECTOR), the fieldbus interface uses REF2 for the speed or torque reference.
When the ABB Drives communication profile is active, the fieldbus interface uses the
following references in the Follower drives:
• When Follower n is in control location EXT1 (stand-alone, speed-controlled), the
fieldbus interface uses REF1 for the speed reference.
Note : For the fieldbus interface to work in follower drives in EXT1, Par. 60.01
MASTER LINK MODE must be set to value NOT IN USE in the follower drives.
Ensure this either through the fieldbus (parameter writing) or DriveAP's Write
block.
• When Follower n is in control location EXT2 (Master/Follower, either speed-
controlled or torque-controlled depending on the selection of Par. 60.02 TORQUE
SELECTOR), the fieldbus interface cannot control the references because they
come through the M/F link (CH).
The figure below illustrates the use of fieldbus references in a Master/Follower
configuration.
Follower n Master
CH2
EXT 1
Stand-alone mode
10.01 EXT1 STRT/STP/DIR
11.03 EXT REF1 SELECT
EXT 2
Master/Follower
10.02 EXT2 STRT/STP/DIR
11.06 EXT REF2 SELECT
EXT 1
Stand-alone mode
10.01 EXT1 STRT/STP/DIR
11.03 EXT REF1 SELECT
EXT 2
Master/Follower
10.02 EXT2 STRT/STP/DIR
11.06 EXT REF2 SELECT
Note : In follower drives in EXT1,
Par. 60.01 must have value NOT IN
USE for the fieldbus interface to
work.