CPU Bus Unit Number Duplication

What does A410.00 to A410.15 mean?

This flag turns ON when a CPU Bus Unit's unit number has been duplicated. Bits 00 to 15 correspond to unit numbers 0 to F. The Duplication Error Flag (A401.13) will also turn ON. The CPU Unit operation will stop, and the ERR/ALM indicator on the front of the CPU Unit will light.

• Two or more CPU Bus Units are configured with the same unit number (0 to F)
• Incorrect physical DIP switch settings on the CPU Bus Units lead to duplicated addresses

Click steps to track your progress.

1. 1

   Identify the problematic CPU Bus Unit(s) by checking the ON status of A410.00 to A410.15 (Bits 00-15 for Unit numbers 0-F)

2. 2

   Physically inspect the DIP switch settings on all CPU Bus Units to verify unique unit numbers

3. 3

   Access the PLC Setup or I/O Table in CX-Programmer to review the configured unit numbers for all CPU Bus Units

4. 4

   Reconfigure either the physical DIP switches or the software settings to ensure each CPU Bus Unit has a unique unit number