Emulation Modbus

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question

Steven Chen asked Jun 25 2018 at 8:55 AM Matt Long commented Jul 19 2018 at 1:11 AM

Emulation Modbus

Hello,

I follow the tutorial TASK 4.1 - BUILD PLC BASIC LADDER LOGIC. Currently I use Modbus to connect a virtual slave, while item cover/uncover photo-eye I can see register value of slave changed, also the transmission data shown in log view. But Flexsim seems doesn't poll value from slave even I check the Poll for External Changes checkbox, no transmission shown in log view.

Hope someone could give me some hint.

emulation-modbus-v1.fsm

Virtual modbus from http://www.modbustools.com/index.html

Software Version:

FlexSim 18.1.1

emulation

slave-communication-traffic.png (44.2 KiB)

emulation-modbus-v1.fsm (36.8 KiB)

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Answer 1 · 2018-07-12T20:26:31Z

Matt Long answered Jul 12 2018 at 8:26 PM Matt Long commented Jul 19 2018 at 1:11 AM

Looks like there may be a bug in the Emulation tool that's causing the polling to not work with modbus. I'm looking into it right now.

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