MODBUS latency/ lag with HMI

[Bri-Guy]

Has anyone here used the “Mudbus” header library for MODBUS Ethernet TCP/IP communications with an HMI and Controllino MAXI?

I am currently implementing it with an MAXI Automation and a Weintek 5070B HMI. I am doing something identical to the tutorial on the main Controllino page entitled: “Controllino HMI with MODBUS”.

The implementation is going GREAT when I am reading/writing REGISTERS (for example Mb.R[2] etc -> MODBUS 4×03 holding register.) …… BUT as soon as I try to use coils/ bits <font face=”inherit” style=”font-family: inherit; font-size: inherit;”>(for example Mb.C[0] etc. -> MODBUS 0x01 bit register) I start to see a very </font>noticeable<font face=”inherit” style=”font-family: inherit; font-size: inherit;”> latency/ lag in the update/refresh of the HMI and I loose Ethernet communication with the HMI momentarily.</font>

<font face=”inherit”>Has anyone else seen this problem? The actual registers respond instantaneously to read & write of integer data BUT as soon as I try to simply look at bits/ coils – the system becomes very unresponsive.</font>

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<font face=”inherit”>Is there something wrong with the “Mudbus” library implementation or is the addressing between the HMI and the PLC somehow incorrect?</font>

<font face=”inherit”>Not sure what is going on!</font>

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<font face=”inherit”>Bri-guy</font>