Beijer Electronics AN-BEI-E2-038 User Manual

Page 4

APPLICATION NOTE AN‐BEI‐E2‐038

Date: 15/02/12

AN‐BEI‐E2‐038 Modbus RTU Control and Register Mapping

Control and Status Register Descriptions:

Read and write registers
Register 1: Drive command

High byte

Low byte

Bit 0:

Run/Stop command: Set to 1 to enable the drive. Set to 0 to stop the drive.

Bit 1:

Fast stop request. Set to 1 to enable drive to stop with 2

deceleration ramp.

Bit 2:

Reset request. Set to 1 in order to reset the drive if drive is under trip condition.

User must clear this bit when drive is under normal condition to prevent un‐expected reset.
Bit 3:

Coast stop request. Set to 1 to issue a coast stop command.

For normal operation, Bit 3 has the highest priority, bit 0 has the lowest priority (bit 3>bit 1>bit 0). For example if user set
command as 0x0009, drive will do a coast stop rather than run. For normal run/start, just set this register to 1.

Note that stat/stop(bit 0), fast stop(bit 1) and coast stop(bit 3) only works if P‐31= 0 or 1. Otherwise, start/stop function is
controlled by drive control terminals. Reset function(bit 2) works all the time as long as drive is operated under Modbus control
mode (P‐12=3 or 4).

Register 2: speed reference setup

This register holds the speed reference value with one decimal place (200 = 20.0Hz). The maximum speed reference value is
limited by P‐01.

Register 4: Acc/Dec ramp setup

This register specifies the drive acceleration and deceleration ramp time. The same value is applied simultaneously to the
acceleration and deceleration ramp times. This register is only active when P‐12 = 4.

Read only registers
Register 6: Drive status and error code

High byte gives drive error code. (Valid when drive tripped, see appendix for details)
Low byte gives drive status

(0: drive stopped, 1: drive running, 2: drive tipped)

Register 7: Motor speed information

This register gives motor speed information. The data is in Hz and with one decimal place ( i.e. 234 = 23.4Hz)

Register 8: Motor current

This register gives motor current information. The data is in Amp with one decimal place (i.e. 87 = 8.7A)

Register 11: Digital input status

The value in this register represents the drive terminal digital input status (Digital input 1 to 4). Lowest bit indicates digital input
1 status.