Beijer Electronics BFI-P2 V1.21 - Manual (Page 47)

User Guide Revision 1.121
www.beijerelectronics.com
47
9.2.2. Modbus Control & Monitoring Registers
The following is a list of accessible Modbus Registers available in the Drive.
• When Modbus RTU is configured as the Fieldbus option, all of the listed registers can be accessed.
•
Registers 1 and 2 can be used to control the drive providing that Modbus RTU is selected as the primary command source (P1‐12 = 4)
and no Fieldbus Option Module is installed in the drive Option Slot.
•
Register 3 can be used to control the output torque level providing that
o The drive is operating in Vector Speed or Vector Torque motor control modes (P4‐01 = 1 or 2)
o The torque controller reference / limit is set for ‘Fieldbus’ (P4‐06 = 3)
• Register 4 can be used to control the acceleration and deceleration rate of the drive providing that Fieldbus Ramp Control is enabled
(P5‐07 = 1)
• Registers 6 to 24 can be read regardless of the setting of P1‐12
Register
Number Upper Byte Lower Byte Read
Write
Notes
1
Command Control Word R/W Command control word used to control the Drive when operating with Modbus RTU.
The Control Word bit functions are as follows :‐
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
nd
deceleration ramp.
Bit 2 : Reset request. Set to 1 in order to reset any active faults or trips on the drive.
This bit must be reset to zero once the fault has been cleared.
Bit 3 : Coast stop request. Set to 1 to issue a coast stop command.
2 Command Speed Reference R/W Setpoint must be sent to the drive in Hz to one decimal place, e.g. 500 = 50.0Hz
3 Command Torque Reference R/W Setpoint must be sent to the drive in % to one decimal place, e.g. 2000 = 200.0%
4
Command Ramp times R/W This register specifies the drive acceleration and deceleration ramp times used when
Fieldbus Ramp Control is selected (P5‐08 = 1) irrespective of the setting of P1‐12. The
input data range is from 0 to 60000 (0.00s to 600.00s)
6
Error code Drive status R This register contains 2 bytes.
The Lower Byte contains an 8 bit drive status word as follows :‐
Bit 0 : 0 = Drive Disabled (Stopped), 1 = Drive Enabled (Running)
Bit 1 : 0 = Drive Healthy, 1 = Drive Tripped
The Upper Byte will contain the relevant fault number in the event of a drive trip.
Refer to section Error! Reference source not found. for a list of fault codes and
diagnostic information
7 Output Frequency R Output frequency of the drive to one decimal place, e.g.123 = 12.3 Hz
8 Output Current R Output current of the drive to one decimal place, e.g.105 = 10.5 Amps
9 Output Torque R Motor output torque level to one decimal place, e.g. 474 = 47.4%
10 OutputPower R Output power of the drive to two decimal places, e.g.1100 = 11.00 kW
11 Digital Input Status R Represents the status of the drive inputs where Bit 0 = Digital Input 1 etc.
20 Analog 1 Level R Analog Input 1 Applied Signal level in % to one decimal place, e.g. 1000 = 100.0%
21 Analog 2 Level R Analog Input 2 Applied Signal level in % to one decimal place, e.g. 1000 = 100.0%
22 Pre Ramp Speed Reference R Internal drive frequency setpoint
23 DC bus voltages R Measured DC Bus Voltage in Volts
24 Drive temperature R Measured Heatsink Temperature in °C
9.2.3. Modbus Parameter Access
All User Adjustable parameters (Groups 1 to 5) are accessible by Modbus, except those that would directly affect the Modbus communications,
e.g.
•
P5‐01 Communication Protocol Select
• P5‐02 Drive Fieldbus Address
•
P5‐03 Modbus RTU Baud Rate
•
P5‐04 Modbus RTU Data Format
All parameter values can be read from the drive and written to, depending on the operating mode of the drive – some parameters cannot be
changed whilst the drive is enabled for example.
When accessing a drive parameter via Modbus, the Register number for the parameter is the same as the parameter number,
E.g. Parameter P1‐01 = Modbus Register 101.
Modbus RTU supports sixteen bit integer values, hence where a decimal point is used in the drive parameter, the register value will be multiplied
by a factor of ten,
E.g. Read Value of P1‐01 = 500, therefore this is 50.0Hz.
For further details on communicating with Drive using Modbus RTU, please refer to your local distributor or Sales Partner.