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AF-7
8. Modbus RTU Communications
8.1. Introduction
The AF-70 can be connected to a Modbus RTU network via the RJ45 connector on the front of the drive.
8.2. Modbus RTU Specification
Protocol
Error check
Baud rate
Data format
Physical signal
User interface
Supported Function Codes
8.3. RJ45 Connector Configuration
8
8.4. Modbus Register Map
Par.
Register
Number
1
-
2
-
4
-
6
-
7
8
11
-
20
DR-01
21
DR-02
22
DR-03
23
DR-08
24
DR-09
All user configurable parameters are accessible as Holding Registers, and can be Read from or Written to using the appropriate Modbus
command. The Register number for each parameter F-04 to H-60 is defined as 128 + Parameter number, e.g. for parameter H-15, the register
number is 128 + 15 = 143. Internal scaling is used on some parameters, for further details please contact your GE Sales Partner.
25
26
Modbus RTU
CRC
9600bps, 19200bps, 38400bps, 57600bps, 115200bps (default)
1 start bit, 8 data bits, 1 stop bits, no parity.
RS 485 (2-wire)
RJ45
03 Read Multiple Holding Registers
06 Write Single Holding Register
16 Write Multiple Holding Registers (Supported for registers 1 – 4 only)
For full MODBUS RTU register map
information please refer to your GE Sales
Partner. Local contacts can be found by
visiting our website
www.geindustrial.com/Drives
When using MODBUS control the Analog and
Digital Inputs
can be configured as shown in section 7.5
Supported
Function
Type
Codes
03 06 16
Low Byte
R/W
" Drive Control Command
"
"
R/W
"
"
" Modbus Speed reference setpoint
R/W
"
"
" Acceleration and Deceleration Time
R
"
Error code
R
"
Output Motor Frequency
R
"
Output Motor Current
R
"
Digital input status
R
"
Analog Input 1 value
R
"
Analog Input 2 value
R
"
Speed Reference Value
R
"
DC bus voltage
R
"
Drive temperature
Function
Range
High Byte
0..3
0..5000
0..60000
Drive status
0..20000
0..480
0..15
0..1000
0..1000
0..1000
0..1000
0..100
1
CAN -
2
CAN +
3
0 Volts
4
-RS485 (PC)
5
+RS485 (PC)
6
+24 Volt
7
-RS485 (Modbus RTU)
8
+RS485 (Modbus RTU)
Warning:
This is not an Ethernet
connection. Do not connect
directly to an Ethernet port.
Explanation
16 Bit Word.
Bit 0 : Low = Stop, High = Run Enable
Bit 1 : Low = Decel Ramp 1 (F-04), High = Decel
Ramp 2 (H-24)
Bit 2 : Low = No Function, High = Fault Reset
Bit 3 : Low – No Function, High = Coast Stop
Request
Setpoint frequency x10, e.g. 100 = 10.0Hz
Ramp time in seconds x 100, e.g. 250 = 2.5 seconds
Low Byte = Drive Error Code, see section 10.1
High Byte = Drive Status as follows :-
0 : Drive Stopped
1: Drive Running
2: Drive Tripped
Output frequency in Hz x10, e.g. 100 = 10.0Hz
Output Motor Current in Amps x10, e.g. 10 = 1.0 Amps
Indicates the status of the 4 digital inputs
Lowest Bit = 1 Input 1
Analog input % of full scale x10, e.g. 1000 = 100%
Analog input % of full scale x10, e.g. 1000 = 100%
Displays the setpoint frequency x10, e.g. 100 = 10.0Hz
DC Bus Voltage in Volts
Drive heatsink temperature in ºC
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