Read And Write More Data Between Plc And Drive (Optional) - ABB ACS310 Quick Start Manual

Quickstart Guide
ABB PLC and drives integration using Modbus RTU
Read and write more data between PLC and drive (optional)
While the already implemented function block "ACS_COM_MOD_RTU" has built‐in functionality to read more
data/parameters from pre‐determined Modbus register addresses in the drive, the function blocks
"ACS_MOD_READ_N_PRM" and "ACS_MOD_WRITE_N_PRM" can read and write data/parameters from Modbus
register addresses according to user choice.
Example ­ Read drive data with "ACS_COM_MOD_RTU"
Values are read from Modbus register addresses 40007.. 40030. The number of read parameters depends on the
function block input "NVAR_READ". Configuration is for instance made in parameters 53.12 to 53.17 for ACS310,
ACS355 and ACS550, or in parameters 58.35 to 58.58 for ACS850 and ACQ810. The supported number of
parameters that can be read in this way depend on actual drive type, for instance 6 parameters can be read from
ACS355 or 24 parameters can be read from ACS850.
Additional parameter settings in the drive are necessary, see example below with an ACS355 drive:

53.12 = 107 → Modbus register 40007 will consist of ACS355 parameter 1.07 DC voltage.

53.13 = 110 → Modbus register 40008 will consist of ACS355 parameter 1.10 Drive temp.

53.14 = 120 → Modbus register 40009 will consist of ACS355 parameter 1.20 Analog input 1.
Note! After these parameter settings, the drive needs a re‐boot (power off/power on) to activate the settings.
Set "ACS_COM_MOD_RTU" block input "NVAR_READ" according to number of parameters to be read (1). Create a
new variable connected to block output "READ_VALUES" (2) and press the "..." button (3) to set the variable of
type "ARRAY" (4) of INT. Give the array Start index 1 and End index 24 (5), press OK.
Modbus RTU ‐ 36 ‐ PLC and drives integration