Group 52: Rs-232 / Panel - ABB ACS550-01 User Manual

ACS550 User's Manual

Group 52: RS-232 / Panel

This group defines the settings required to connect the ACS550 to a Modbus
fieldbus system. For example: station number, communication speed, and parity.
In this group, parameter modifications take effect on the next power-up.
Code Description
5201 STATION ID
Defines the address of the drive.
• Two units with the same address are not allowed on-line.
• Range: 1...247
5202 BAUDRATE
Defines the communication speed of the drive in kbits per second (kbits/s).
9.6
19.2
38.4
57.6
115.2
5203 PARITY
Sets the character format to be used with the panel communication.
0 = 8 1 – No parity, one stop bit.
N
1 = 8 2 – No parity, two stop bits.
N
2 = 8 1 – Even parity, one stop bit.
E
3 = 8 1 – Odd parity, one stop bit.
O
5204 OK MESSAGES
Contains a count of valid Modbus messages received by the drive.
• During normal operation, this counter is increasing constantly.
5205 PARITY ERRORS
Contains a count of the characters with a parity error that is received from the bus. For high counts, check:
• Parity settings of devices connected on the bus – they must not differ.
• Ambient electro-magnetic noise levels – high noise levels generate errors.
5206 FRAME ERRORS
Contains a count of the characters with a framing error that the bus receives. For high counts, check:
• Communication speed settings of devices connected on the bus – they must not differ.
• Ambient electro-magnetic noise levels – high noise levels generate errors.
5207 BUFFER OVERRUNS
Contains a count of the characters received that cannot be placed in the buffer.
• Longest possible message length for the drive is 32 bytes.
• Received messages exceeding 32 bytes overflow the buffer. The excess characters are counted.
5208 CRC ERRORS
Contains a count of the messages with a CRC error that the drive receives. For high counts, check:
• Ambient electro-magnetic noise levels – high noise levels generate errors.
• CRC calculations for possible errors.
103
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