ABB FSCA-01, User Manual

Page: 36 / 90

36 Start-up
05 Parity Defines the use of parity and stop bit(s) and
the data length. The same settings must be
used in all on-line stations. 0 = 8 None 1
0 = 8 None 1 No parity bit, one stop bit, 8 data bits
1 = 8 None 2 No parity bit, two stop bits, 8 data bits
2 = 8 Even 1 Even parity indication bit, one stop bit,
8 data bits
3 = 8 Odd 1 Odd parity indication bit, one stop bit,
8 data bits
06 Modbus timeout The Modbus/RTU protocol does not specify
a timeout mechanism for the application
layer. ABB Drives and the FSCA-01
module provide a Modbus timeout method
as it may be desired for drive control.
The timeout is:
For example, a MODBUS TIMEOUT value
of 22 would result in a timeout of:
When a Modbus timeout occurs, the
adapter module signals the drive that
communication with the master has been
lost. The drive configuration determines
how it responds.
Example: If you configure the MODBUS
TIMEOUT as 250 ms and the drive is
configured to fault on a communication
failure with a delay of 500 ms, then the
drive faults 750 ms after the
communication is lost.
0
0…65535 Modbus timeout value
07 Timeout mode Selects which Modbus register accesses
reset the timeout counter. 0 = None
0 = None Modbus timeout feature is disabled.
1 = Any message Timeout counter is reset when any Modbus
register of the drive is accessed.
2 = Ctrl write Timeout counter is reset when the drive
receives either a new Control word or new
reference value (REF1 or REF2) from the
Modbus master.
No. Name/Value Description Default
(MODBUS TIMEOUT value) * 100 milliseconds
22 * 100 milliseconds = 2.2 seconds