ABB ACS 400 - Page 125

114 ACS 400 User’s Manual
Group 50: Communication
Parameters of this group define some general communication settings. Parameters 5001-5002 and
5007-5009 are used only if the DDCS option module is installed.
Code Description
5001 DDCS BIT RATE
DDCS link baud rate in Mbits/s.
5002 DDCS NODE NR
DDCS link node number.
5003 COMM FAULT TIME
Communication time out delay. This applies both to standard Modbus and DDCS link.
When communication loss supervision is activated by parameter 5004
COMM FAULT FUNC, the bus master
must write Control Word, Reference 1 or Reference 2 periodically. The maximum period is set by this
parameter.
5004 COMM FAULT FUNC
Communication fault function. This applies both to standard Modbus and DDCS link.
0 =
NOT SEL
No operation.
1 =
FAULT
A fault indication is displayed and the ACS 400 coasts to stop.
2 =
CONST SP 7
A warning indication is displayed and the speed is set according to parameter 1208
CONST SPEED7.
3 =
LAST SPEED
A warning indication is displayed and the speed is set to the level at which the ACS 400 was last operating.
This value is determined by the average speed over the last 10 seconds.
Caution: If you select
CONST SPEED 7 or LAST SPEED, make sure that it is safe to continue operation in case
communication is lost.
5005 PROTOCOL SEL
Defines what communication protocols are used. Options 1 (DDCS) and 3 (STD MDB+DDCS) should be
selected only if a DDCS communication module is installed.
0 =
NOT SEL
No serial communication is active.
1 =
DDCS
DDCS serial communication is active.
2 =
STD MODBUS
Standard Modbus protocol is active.
3 =
STD MDB+DDCS
Both standard Modbus and DDCS are active.
5006 COMM COMMANDS
The commands source protocol selection. Although the ACS 400 can communicate simultaneously via
several serial communication channels, the controlling commands - start, stop, direction and reference - can
be received only from a single communication channel, selectable by this parameter.
0 =
NOT SEL
Controlling commands are not received via serial communication.
1 =
STD MODBUS
Controlling commands can be received through Channel 1 standard Modbus protocol.
2 =
DDCS
Controlling commands can be received through the DDCS link.
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