ABB ACS 400 User Manual

Also see for ACS 400: User guide User manual Installation guide User manual

Contents

ABB ACS 400 User Manual Manual pdf 102 page image

92 ACS 400 User’s ManualGroup 52: Standard ModbusThe ACS 400 can be connected to a Modbus fieldbus system. Parameters of this group are used toset up station number, communication speed and parity. Parameters 5206 - 5215 are diagnosticcounters that can be used to debug the fieldbus system. Refer to “Standard Serial Communication”on page 95 for more information.Code Description5201 STATION IDSets the slave number for the ACS 400 in Modbus network.Range: 1 - 247Note! Modifications take effect only on the next power up.5202 COM SPEEDDefines the communication speed of the ACS 400 in bits per second (bps).Note! Modifications take effect only on the next power-up.5203 PARITYDefines the parity to be used with the Modbus communication. Parameter also defines the number of stopbits. With Modbus communication, the number of stop bits is 2 with no parity bit, and 1 with even or oddparity.0 = NONE1 = EVEN2 = ODDNote! Modifications take effect only on the next power-up.5206 BAD MESSAGESThis diagnostics counter increases by one every time the ACS 400 finds any kind of communication error.During normal operation, this counter hardly ever increases.5207 GOOD MESSAGESThis diagnostics counter increases by one every time a valid Modbus message has been received by theACS 140. During normal operation, this counter is increasing constantly.5208 BUFFER OVERRUNSLongest possible message length for the ACS 400 is 32 bytes. If a message exceeding 32 bytes is received,this diagnostic counter increases by one every time a character is received and cannot be placed in thebuffer.5209 FRAME ERRORSThis diagnostic counter increases by one every time when a character with a framing error is received fromthe bus.• Communication speed settings of the devices connected in the bus differ.• Ambient noise levels may be too high.5210 PARITY ERRORSThis diagnostic counter increases by one every time when a character with a parity error is received fromthe bus.• Parity settings of the devices connected in the bus differ.• Ambient noise levels may be too high.3 = 300 bps 48 = 4800 bps6 = 600 bps 96 = 9600 bps12 = 1200 bps 192 = 19200 bps24 = 2400 bps