QA Extension Base Unit (QA1S51B)

Supported series:

Replace the AnS/QnAS Series CPU with the Q Series CPU while keeping the existing AnS/QnAS Series modules

Gradual transition from the AnS/QnAS Series to the Q Series (Q mode)

• Construct a system that is controlled by the new Q Series CPU (Q mode) while keeping the existing AnS/QnAS Series modules installed to a QA1S□B extension base unit. The AnS/QnAS Series modules can gradually be replaced to comprise a Q Series-only system at the end.
  
• The QA1S□B extension base units are compatible with the Universal model QCPUs^*1 (including the High-speed Universal model QCPUs). Process CPUs, redundant CPUs, Safety CPUs and remote I/O Stations are not compatible.
• Some modules are not installable on the QA1S□B extension base unit. For details, please refer to the "QCPU User's Manual (Hardware Design, Maintenance and Inspection) (SH(NA)-080473ENG)".
• No further extensions can be made to QA1S51B because QA1S51B is not equipped with an extension cable connector.

*1.The Universal model QCPU of which first 5-digit serial number is 13102 or later, is compatible with the base units.

Reduce conversion effort by using the same I/O addresses

• When utilizing existing modules with a Q Series CPU, it is not required to change the I/O number of the existing modules. For new module(s) on the main base unit, assign a subsequent number, which comes after the existing module numbers in the I/O assignment settings. This can greatly reduce the program modification time.
  

Note:Assign the I/O numbers in the following order: Q Series to AnS/QnAS Series or AnS/QnAS Series to Q Series.
When the order is mixed (i.e., Q Series → AnS/QnAS Series → Q Series), an error will occur in the CPU.

Example of I/O assignment

Related documents

Transition from MELSEC-AnS/QnAS (Small Type) Series to Q Series Handbook (Fundamentals)

2021-03