You are currently viewing the content available in Vietnam. If you are looking for information for another region, please select the correct country from the top-left dropdown in the page and 'Navigate to Browse FAQs' in the Support menu.
Quantum message request gives incorrect values.
Goals and Symptoms
Quantum message request gives incorrect values.
Causes and Fixes
When requesting a register value from a quantum device, the response returns the value from the next addressed value, while making the same request to a Premium or M340 device the address is correct.
This stems from the different historical method of counting for the different families of PLCs. In quantum the registers begin counting at 1 (one). Thus 40001 would be the first register and there would be no 40000 register. In Premium and M340 the first register begins at 0 (zero). Unity uses IEE standards and thus %MW0 – the first memory word would be 40001 in the Quantum. In order to request a register and receive the proper addressed response The 4x register should be decremented by 1. %MW0 = 40001, %MW98 = 40099. The decremented value should be used in all communication to any Quantum PLC.
Quantum message request gives incorrect values.
Causes and Fixes
When requesting a register value from a quantum device, the response returns the value from the next addressed value, while making the same request to a Premium or M340 device the address is correct.
This stems from the different historical method of counting for the different families of PLCs. In quantum the registers begin counting at 1 (one). Thus 40001 would be the first register and there would be no 40000 register. In Premium and M340 the first register begins at 0 (zero). Unity uses IEE standards and thus %MW0 – the first memory word would be 40001 in the Quantum. In order to request a register and receive the proper addressed response The 4x register should be decremented by 1. %MW0 = 40001, %MW98 = 40099. The decremented value should be used in all communication to any Quantum PLC.
Released for: Schneider Electric Vietnam
