AcraDyne LIT-MAN177 Gen IV Controller Modbus TCP Instructions
- June 5, 2024
- AcraDyne
Table of Contents
Gen IV Controller
Modbus TCP Instructions
The AcraDyne controller supports the Modbus/TCP Server protocol on the local
Ethernet port.
The controller can accept messages from a Modbus/TCP Client and return
responses to the Client.
From the main menu, select Controller. 
Select IO.
Following are the Modbus TCP options
Supported Features:
The Modbus/TCP server supports the Modbus RTU protocol. Modbus RTU is a communication protocol that represents devices as “Registers” and “Coils.” Modbus TCP defines multiple classes of devices based on functionality. The controller is a Class 1 device supporting all Class 0 and 1 functions.
- Class 0 devices must support function codes 3 and 16
- Class 1 devices must support function codes 1–7 and 16.
The supported functions are:
- Function Code 1 – Read Coil Status
- Function Code 2 – Read Input Status
- Function Code 3 – Read Holding Registers
- Function Code 4 – Read Input Registers
- Function Code 5 – Force Single Coil
- Function Code 6 – Write Single Holding Register
- Function Code 7 – Read Exception Status
- Function Code 16 – Write Multiple Holding Registers
AcraDyne Gen IV Controller: Modbus TCP Instructions
Controller Outputs Addressing
The controller’s assignable outputs are mapped as Modbus TCP input registers.
The first two assignable output bytes are registered 0 followed by register 1
(bytes 2 & 3). Since Modbus TCP uses 16-bit registers it is helpful to create
assignments with a size of INT16. The controller’s outputs can be read with
function code 4 “Read Input registers.”
The controller’s outputs can also be addressed as coils. The assigned outputs
start at coil #16. The controllers outputs can be read with function code 2
“Read Input Status.”
Controller Inputs Addressing
The controller’s assignable inputs are mapped as Modbus TCP holding registers.
The first two assignable input bytes are registered 1000 followed by register
1001 (bytes 2 & 3). Since Modbus TCP uses 16-bit registers it is helpful to
create assignments with a size of INT16. The controller’s inputs can be
written with function code 6 “Write Single Holding register” and function
Code 16 “Write Multiple Holding registers.” The controller’s inputs can also
be read with function Code 3 “Read Holding registers.”
The controller’s inputs can also be addressed as coils. The assigned inputs
start at coil #1015.
The controller’s inputs can be written with function code 5 “Force Single
Coil.” The controller’s inputs can also be read with function code 1 “Read
Coil Status.”
Modbus TCP Inputs
These types of communication are useful for data communication between
controllers and PLCs. It is an effective, quick way for the data transfer of
short data packages.
Example of the Modbus TCP Input screen with five Inputs set up.
Click on to change an individual Element or return to the Input Configuration
screen.
Will delete individual Elements.
Element Type: Choose from Byte,
Int16, Int32, or ASCII.
Element: Shows element # being configured
Bit (not shown): Enter Bit #.
Bits : # of bits the assignment will read.
Start at : Starting bit location.
Polarity (not shown): Select Normally Open (N.O.) or Normally Closed
Outputs (N.C.).
Length (not shown, available in ASCII ID function): Number of characters
desired to send.
Torque (not shown, available in Click Wrench function): Torque value to
be reported when using Click Wrench input. Value input is what will be sent
from the controller when Input Signal is received from a Click Wrench. Value
is NOT calculated by the controller rather it is solely what the Click Wrench
is calibrated to by outside means.
Torque Units (not shown, available with Click Wrench function): Choose
from Nm, Kgm, Kgcm, Ftlb, and Inlb.
Function: See the Gen IV Controller User Manual for more details. Select
desired Input Function(s).
Click on it after appropriate selections are made. 
Example of the Modbus TCP Output screen with five Outputs set up.
Click on it to change an individual Element or return to the Input
Configuration screen.
Will delete individual Elements.
Element Type: Choose from
Byte, Int16, Int32, or ASCII.
Element: Shows element #
being configured
Bit: Enter Bit #.
Bits (not shown): # of bits the assignment will read.
Start at: Starting bit location.
Polarity: Select Normally Open or Normally Closed Outputs.
Mode:
- Normal: Output signal sent.
- Timed Signal Sent: Time entered in seconds
- Flash Signal Sent: Time entered in seconds
Function: See the Gen IV
Controller User Manual for more details on assignable functions.
Click on after appropriate selections are made.
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