Unitronics Jazz PLC

This document details how to set up a Wildeye to communicate with a Unitronics Jazz PLC.

Introduction

Unitronics PLC is a unique system that can be used as either a master or a slave depending on the requirements of the system. Wildeye loggers only work as a Modbus Master. This means that the Unitronics Jazz would need to be a Modbus slave and must be configured either as RS232 or RS485.

Configuration

Software Ladder Program Setup

Setup the Ladder program to enable Modbus by storing values into the System Integer (SI)

Parameter	SI	Function
Network ID	141	Range: 0-255. This is the Network ID number of the device on the network. You can either assign an ID via an MI, or directly via a constant number. Do not assign the same ID number to more than one device.
Time out	142	Time out units:10 msecs; a Time out value of 100 is equal to 1 second. This is the amount of time a master device will wait for an answer from a slave.
Retries	143	This is the number of times a device will try to send a message.
Maximum Time Delay	144	Time units: 2.5 msec. This is the maximum time interval permitted between 2 messages. This should be set to 2, setting the permitted interval to 5 msecs (n x 2.5 =interval).
Baud Rate	145	Store the value into SI 145 to set the baud rate. Note that Jazz does not support the following baud rates: 110, 38400, 57600. In addition, ‘2’ Stop Bits is not supported. In Jazz controllers; use Function 310 to modify the default settings of an Add-on Port. Legal Baud rates are: 110 300 600 1200 2400 4800 9600 19200 38400 (store 384) 57600 (store 57600)
Call MODBUS Configuration	140	This must be the final parameter stored. Storing the value 600 into SI 140 configures the controller for MODBUS. Storing the value 599 into SI 140 configures the controller for MODBUS and also enables Unitronics' PC applications to access the PLC.

After Modbus has been setup, Configure the port by storing values into the System Integer (SI) again.

Parameter	SI	M91	Jazz: MJ20-RS	Jazz: MJ20-PRG
Baud Rate	141	Legal Baud rates, Store value into SI 141 to set baud rate.
		110 300 600 1200 2400 4800 9600 19200 38400 (store 384) 57600 (store 576)	300 600 1200 2400 4800 9600 19200	300 600 1200 2400 4800 9600
Data bits	142	7 8
Parity	143	0=even 1=odd 2=none
Hardware Flow Control	144	0=No Flow Control 1=Flow Control	RS232: 0=No Flow Control 1=Flow Control 2=enable RS485 and RS232 Note that in order to implement RS485, you must write 2 to SI144	Always write 0
Time out	145	Time out units: 10 msecs; a Time out value of 100 is equal to 1 second. Legal values: 50 100 150 200 500 6000
Stop bits	146	1 2	2 stop bits is not supported
COM Init	140	This must be the final parameter stored. Storing the value 310 into SI 140 initializes the COM port with the new parameters.

It should look something like this.
- Address: 2, Baud rate: 9600, Data bits: 8, Party: None, Stop bit: 1 etc.

Hardware Setup

Ensure that the Wildeye cable is connected to the RS485 port of the PLC. This is usually a separate module on that would need to be purchased separately and should fit in the right hand side (from back view) of the Jazz PLC. You should be able to see the RS485 Indicator facing towards the installer. Ensure that the Termination on the RS485 module is correct and are in the same position. If this is the end of the RS485 line, then the termination switch should BOTH be in the ON position.

The RS485 module uses the A, B notation for the RS485. This is usually not standard and would be unique to each sensor. In this case, the A port is the D+ line and the B port is the D- line

Notation on the PLC	Logger Notation	Colour of Wire from the Logger
A	D+	White
B	D-	Grey

Setting up Inputs on the logger

There are some limitations that requires more investigation. However, currently we are able to successfully read, System Bits, System Integer, Memory Bits, Memory Integer and we were able to successfully execute a Write Register command

We have yet to attempt the Input, Output and timers. We were also unsuccessful in executing a Single Write coil.

Slave Mapping

The input setup would be based on the Ladder function code that the PLC has installed. This would be different for each PLC as each register and coil can be programmed to contain their desired value.

However, the slave mapping would be as follows.