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MEDIDOR ION 7400 - MODULO MODBUS SLAVE - COM PROBLEMA

Metering & Power Quality

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darkenwald
darkenwald
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Posted: ‎2025-12-29 06:28 AM . Last Modified: ‎2025-12-29 06:32 AM

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‎2025-12-29 06:28 AM

MEDIDOR ION 7400 - MODULO MODBUS SLAVE - COM PROBLEMA

Olá, senhores.
Estou com problema com um medidor ION 7400 no qual o módulo modbus salave não está funcionando corretamente.

Por exemplo, estou lendo os dados de tensão corretamente como este mostrado na imagem abaixo:

darkenwald_0-1767018164332.png

darkenwald_1-1767018289009.png

 

E a leitura do shortbus e no modbuspoll é idêntica porem diferente do valor real medido pelo medidor, que pode ser confirmado na imagem anterior e nas imagens abaixo:

darkenwald_2-1767018366207.png

 

darkenwald_3-1767018425102.png

 

  Existe um método de restauração de fabricação de um medidor ion 7400??? Ou outra forma de resolver esses problemas????????

 

  Agradeço sua atenção!

 

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Mehran_Mehrnia
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Posted: ‎2025-12-30 01:46 PM

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‎2025-12-30 01:46 PM

Hi @darkenwald 

In Modbus TCP for ION meters, the Unit ID (or Slave ID) is used as a routing indicator rather than a physical address. The reason ID 255 works while ID 1 fails is due to the meter’s Modbus Gateway setting.

 

The reason ID 255 works is that when the 'Gateway' is enabled, Unit ID 255 is reserved for the local device (the meter itself). Requests sent to ID 1(or any ID other than 255) are assumed to target a downstream serial device connected to the meter’s RS-485 port. If no mapping exists, the meter returns a Modbus exception.

 

When 'Gateway' is disabled, the meter stops routing and responds to any Unit ID (1, 100, 255, etc.) with its own data.

 

In order to poll the meter with the desired Unit ID, you need to disable the gateway, in ION Setup (Advanced Mode):

  1. Hold Ctrl key and click the meter.
  2. Navigate to Modbus Master Option Modules → Modbus Master Option 1 → Setup Registers.
  3. Change 'MMO1 ModbusGate Connection' to 'Gateway Disabled'.

Mehran_Mehrnia_0-1767130831777.png

 

 

Best Regards,

-Mehran

L3 Expert Advanced metering

See Answer In Context

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Jesus_Diaz
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Posted: ‎2025-12-29 03:30 PM

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‎2025-12-29 03:30 PM

Hi @darkenwald,


Do you have any other Modbus Slave Modules in your meter? Please check the base address of your Modbus Slave Module to ensure you are reading the correct addresses.


Additionally, when reading Modbus TCP, set the device ID to 255 and verify the readings.

 

I tested a similar setup, and the registers have the correct values.

 

Jesus_Diaz_0-1767050940913.png

 

 

Regards,
JD

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darkenwald
darkenwald
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Posted: ‎2025-12-30 05:28 AM

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‎2025-12-30 05:28 AM

   Ola, realizei o teste e os dados vinheram corretamente, como mostra a imagem abaixo:

darkenwald_0-1767101253273.png

Agora qual o procedimento para normalizar a leitura no ID=1 ???

 

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Mehran_Mehrnia
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Posted: ‎2025-12-30 01:46 PM

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‎2025-12-30 01:46 PM

Hi @darkenwald 

In Modbus TCP for ION meters, the Unit ID (or Slave ID) is used as a routing indicator rather than a physical address. The reason ID 255 works while ID 1 fails is due to the meter’s Modbus Gateway setting.

 

The reason ID 255 works is that when the 'Gateway' is enabled, Unit ID 255 is reserved for the local device (the meter itself). Requests sent to ID 1(or any ID other than 255) are assumed to target a downstream serial device connected to the meter’s RS-485 port. If no mapping exists, the meter returns a Modbus exception.

 

When 'Gateway' is disabled, the meter stops routing and responds to any Unit ID (1, 100, 255, etc.) with its own data.

 

In order to poll the meter with the desired Unit ID, you need to disable the gateway, in ION Setup (Advanced Mode):

  1. Hold Ctrl key and click the meter.
  2. Navigate to Modbus Master Option Modules → Modbus Master Option 1 → Setup Registers.
  3. Change 'MMO1 ModbusGate Connection' to 'Gateway Disabled'.

Mehran_Mehrnia_0-1767130831777.png

 

 

Best Regards,

-Mehran

L3 Expert Advanced metering

Reply
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