IMO Precision Controls i3 Tutorial
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IMO Precision Controls i3 Tutorial

Modbus slave
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Modbus Slave

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  • Page 1 Modbus Slave...

  • Page 2: Table Of Contents

    TABLE OF CONTENTS ....................2 INTRODUCTION......................3 MODBUS MAP ......................4 PROTOCOL CONFIGURATION................5 PROGRAMMING EXAMPLE ..................6 ..................6 ADDER OGIC ROGRAMMING .................7 CREEN DITOR ROGRAMMING PMU P ....................7 ROGRAMMING PMU - i screens ....................9 ....................11 IRING IAGRAM MJ2 PINS........................11 ...................11 UNNING THE ROGRAM ©IMO Precision Controls ltd.

  • Page 3: Introduction

    Introduction The purpose of this tutorial is to demonstrate the Modbus slave communication functions of the i In this tutorial we will demonstrate the i as a Modbus slave with a HMI connected to the i controlling it. The advantage of having the capability of connecting to an external HMI allows data to be represented in different aspects in another location.

  • Page 4: I 3 Modbus Map

    Read Input Register (4) 03000 %SR1 34001 304001 04000 %AQ1 40001 400001 00000 Read Holding Registers (3) Preset Single Register (6) 03000 (Previously 43001 9999 410001 for 2048 registers) Preset Multiple Registers 06000 (16) %AQG1 46001 406001 10000 ©IMO Precision Controls ltd.

  • Page 5: Protocol Configuration

    Protocol Configuration Unlike with the master setting there is no protocol to set up before programming the ladder logic. The Modbus slave configuration is completely set up in Ladder logic. www.imopc.com...

  • Page 6: Programming Example

    Select from the Communication Operations the Open Communication Port function icon , insert it into a rung with an ‘Always On’ contact. Now select a Modbus slave function icon and insert it into the same rung. ©IMO Precision Controls ltd.

  • Page 7: Screen Editor Programming

    Double click on the functions and insert the parameter details as shown. This Port Open function Opens the selected port and designates a protocol to it. The Modbus slave function defines the slave’s address and a status register so that the communication link status can be viewed.
  • Page 8 Message - %R4 43004 Graph - %R7 43007 Up - %K6 15006 Reset - %K10 15010 Keys - %K1 to %K4 15001 to 15004 Alarm - %R4 43004 Inputs - %I1 to %I4 10001 to 10004 ©IMO Precision Controls ltd.

  • Page 9: Pmu - I 3 Screens

    PMU - screens www.imopc.com...
  • Page 10 Modbus Slave ©IMO Precision Controls ltd.

  • Page 11: Wiring Diagram

    Wiring Diagram We are using Port 2 on the i as a RS485, 2 wire, twisted-pair to connect to the PMU330TT. The wiring for this is as follows. Port 2 connections. PMU330TT MJ2 Pins This wiring has the advantage that both the PMU and i can still have their programming ports connected, thus making debugging easier.
  • Page 12 Modbus Slave Modbus Slave ©IMO Precision Controls ltd. ©IMO Precision Controls ltd.

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