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8. Modbus protocol
The link between the drive parameters and the communication scanner variables can be made:
- Via the display terminal (see section "6. Configuration - 6.2 Communication scanner")
- Via Modbus: Before starting the application, the PLC must first write the address tables described below.
Example
• Use of the "Read/Write Multiple Registers" function (request code: 23 = 16#17)
• Transmission of the request to a drive located at address 20 (16#14)
• Reading all 8 scanner input variables
• List of source parameters:
• Writing the first 6 scanner output variables
• List of target parameters:
Output variable address Logic address Default value
[Scan.Out1 address] (nCA1) 12 721 = 16#31B1 8501 = 16#2135
[Scan.Out2 address] (nCA2) 12 722 = 16#31B2 8602 = 16#219A
[Scan.Out3 address] (nCA3) 12 723 = 16#31B3 0
[Scan.Out4 address] (nCA4) 12 724 = 16#31B4 0
[Scan.Out5 address] (nCA5) 12 725 = 16#31B5 0
[Scan.Out6 address] (nCA6) 12 726 = 16#31B6 0
[Scan.Out7 address] (nCA7) 12 727 = 16#31B7 0
[Scan.Out8 address] (nCA8) 12 728 = 16#31B8 0
Input variable address Logic address Default value
[Scan. IN1 address] (nMA1) 12 701 = 16#319D 3201 = 16#0C8B
[Scan. IN2 address] (nMA2) 12 702 = 16#319E 8604 = 16#219C
[Scan. IN3 address] (nMA3) 12 703 = 16#319F 0
[Scan. IN4 address] (nMA4) 12 704 = 16#31A0 0
[Scan. IN5 address] (nMA5) 12 705 = 16#31A1 0
[Scan. IN6 address] (nMA6) 12 706 = 16#31A2 0
[Scan. IN7 address] (nMA7) 12 707 = 16#31A3 0
[Scan. IN8 address] (nMA8) 12 708 = 16#31A4 0
No.
Parameter
Logic
address
Read
value
No.
Parameter
Logic
address
Read
value
1
Status word (EtA)
3201 16#0007 5
Power section AC supply voltage
(ULn)
3207 16#00F0
2
Output speed (rFrd)
8604 16#1388 6
Drive thermal state (tHd)
3209 16#0065
3
Motor current (LCr)
3204 16#0064 7
Motor thermal state (tHr)
9630 16#0032
4
Output torque (Otr)
3205 16#0045 8
Altivar fault code (LFt)
7121 16#0000
No.
Parameter
Logic
address
Value to
be written
No.
Parameter
Logic
address
Value to
be written
1
Control word (CMd)
8501 16#000F 5
[Acceleration] (ACC)
9001 16#04B0
2
Speed reference (LFrd)
8602 16#1388 6
[Deceleration] (dEC)
9002 16#0258
3
High speed (HSP)
3104 16#1F40 7
-
0 16#0000
4
Low speed (LSP):
3105 16#01F4 8
-
0 16#0000