ABB ACS550-02 User Manual page 153

Communication Settings
Communication settings define the station number, communication speed, parity
checking, and number of stop bits. These settings are defined using parameters in
Group 53: EFB Protocol. The default settings are defined in the following table.
Parameter
Default Setting
For more information on these parameters, see
135 .
Note! After any changes to the communication settings, protocol must be
reactivated by either cycling the drive power, or by clearing and then restoring the
station Id (5302).
Loss of Communication
Use Group 30: Fault Functions to configure ACS550 behavior if communication is
lost. The default settings are defined in the following table:
Parameter
3018
COMM FAULT FUNC
3019
COMM FAULT TIME
For more information on these parameters, see
108 .
Diagnostic Counters
The ACS550 includes three parameters (5306, 5307, 5308) that act as diagnostic
counters for use in debugging the Modbus system. These counters:
• Count to 65535, then roll over to 0.
• Store their values in permanent memory when power is disconnected.
• Can be reset from either the control panel or serial communication by writing a
zero to the parameter.
Control Locations
The ACS550 can receive control information from multiple sources, including digital
I/O, analog I/O, the control panel, and serial communication. To control the ACS550
via the RS485 port, you must:
• Set parameters to accept serial communication control commands (see
CONTROL WORD and the STATUS WORD – Standard Profile (ABB DRIVES)
section below) and/or frequency references (see
Channel 1 Communication Settings
Station Communication
Number Speed
5302 5303
1 9600 bps
= 0 ( ) – No response to loss of serial communication.
NOT SEL
= 3 – Loss of serial communication must be at least 3 seconds before
specified response (if any).
Parity Stop
Bit Bits
5304
None 2
Group 53: EFB Protocol
Default Setting
Group 30: Fault Functions
References
section below).
151
Number Of
Data Bits
None
8
on page
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The
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