P2 Series User Guide |
Version 3.01
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9
Serial Communications
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 2nd 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.
Bit 2 : No Function.
Bit 3 : Drive Ready, 1 = Drive Inhibit.
Bit 4 : Maintenance Time Not Reached, 1 = Maintenance Time Reached.
Bit 5 : 0 = Not In Standby (Sleep), 1 = Standby (Sleep) mode active.
Bit 6 : No function.
Bit 7 : 0 = Normal condition, 1 = Low or High Load condition detected.
The Upper Byte will contain the relevant fault number in the event of a drive trip.
Refer to section 11.1. Fault Messages for a list of fault codes and diagnostic information.
Bit 8 : No Function.
The Upper Byte will contain the relevant fault number in the event of a drive trip.
Refer to section 11.1. Fault Messages 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
Output Power
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 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. Some
parameters are internally scaled, for further information refer to the P2 drive Modbus Register Map Application Note, or Advanced
User Guide.
E.g. Parameter P1-03 = Modbus Holding Register 103.
Since Modbus RTU supports sixteen bit integer values only, and the parameter is adjustable to one decimal place, the register value
will be multiplied by a factor of ten,
E.g. Read Value of P1-03 = 50, therefore this is 5.0 seconds.
