ABB FENA-01 - Page 55

Modbus/TCP – Start-up 55
19 T16 SCALE Defines the reference multiplier/actual value
divisor for the adapter module. The parameter
is effective only when the Transparent 16
profile is selected AND the drive is using the
native communication profile (eg, DCU or FBA)
and a 16-bit transparent Reference 1/Actual
value 1.
With an ACS355 drive, the speed reference
from the PLC is multiplied by the value of this
parameter plus one. For example, if the
parameter has a value of 99 and a reference of
1000 given by the master, the reference will be
multiplied by 99 +1 = 100 and forwarded to the
drive as 100000. According to the DCU profile,
this value is interpreted as a reference of
100 rpm in the drive.
With ACSM1, ACS850, ACQ810, ACS880 and
ACS580, setting this parameter to 65535
provides an approximation of 1 = 1 rpm.
99
ACS355:
FB PAR 19
ACSM1:
FBA PAR19
ACS850/ACQ810:
FBA par19
ACS880/ACS580:
T16 scale
0…65535 Reference multiplier/actual value divisor
20 MODBUS/TCP
TIMEOUT
Defines the Modbus/TCP timeout value.
The Modbus protocol does not specify a
timeout mechanism for the application layer. A
timeout mechanism may be desired when
controlling a drive, so the adapter module
provides a method for this purpose.
• If the parameter value is zero, this feature is
disabled.
• If the parameter value is non-zero, the
timeout is:
For example, a value of 22 results in a timeout
of:
If a timeout occurs, the adapter module signals
the drive that communication with the client has
been lost. The drive configuration then
determines how to respond.
Example: If the Modbus/TCP timeout is
250 ms and the drive is configured to fault on a
communication failure with a delay of 500 ms,
the drive will fault 750 ms after communications
is lost.
20
ACS355:
FB PAR 20
ACSM1:
FBA PAR20
ACS850/ACQ810:
FBA par20
ACS880/ACS580:
Timeout time
0…65535 Modbus/TCP timeout value
No. Name/Value Description Default
(Modbus/TCP timeout value) * 100 milliseconds
22 * 100 milliseconds = 2.2 seconds