140CPU43412U

What is this module used for in a Modicon Quantum system?

It is a Unity processor (CPU) for the Modicon Quantum automation platform. It executes the control application, manages I/O updates, handles communications, and coordinates local and remote Quantum racks within a PLC system.

How much memory does the processor provide?

It has 1056 kB of internal RAM for the control application and related data.

What is the processor speed?

The module operates with a 66 MHz clock frequency.

Which communications are built in?

It includes integrated ports for Modbus Plus (1 port) and Modbus (2 ports), providing common connectivity options for Quantum networks and serial Modbus communications.

What connectors are on the front of the processor for communications?

It uses SUB-D 9 connectors: one female SUB-D 9 for Modbus Plus, and two female SUB-D 9 connectors for the Modbus ports.

How much current does the module draw from the backplane?

The bus current requirement is 1800 mA, which should be considered when sizing the rack power supply and overall backplane load.

What do the front-panel LEDs indicate?

Key indicators include: communications activity on Modbus Plus and Modbus (green), CPU status (READY green and RUN green), memory write protection status (MEM PRT orange), battery status (BAT LOW red), and Modbus Plus error indication (ERROR A red).

Does the processor have hardware switches for operating mode and protection?

Yes. It has a key switch used for memory start/stop and memory protection functions, plus a slide switch used to select the communication port mode (ASCII/RTU/Memory).

How many local racks can be used with this processor?

It supports up to 2 local racks in a Modicon Quantum configuration.

What is the supported scale for distributed and remote I/O?

It supports up to 63 distributed I/O stations (on Modbus Plus networks) and up to 31 remote I/O stations using S908 remote I/O racks (with up to 2 remote racks referenced in the product characteristics).

What is the maximum discrete I/O capacity supported?

Typical limits include up to 8000 inputs and 8000 outputs per Modbus Plus distributed network, and up to 31744 inputs and 31744 outputs for remote I/O. Local discrete I/O capacity is shown as unlimited (with a practical rack slot limit of 26).

What is the analogue I/O capacity supported?

Typical limits include up to 500 analogue inputs and 500 analogue outputs per Modbus Plus distributed network, and up to 1984 analogue inputs and 1984 analogue outputs on S908 remote I/O. Local analogue I/O is listed as unlimited (with a practical rack slot limit of 26).

How fast is the instruction execution?

Typical execution time ranges are 0.12 to 0.585 µs for Boolean and word instructions, and 0.1 to 0.27 µs for fixed-point and floating-point arithmetic (depending on instruction type and conditions).

How is application processing structured on this CPU?

It supports a structured task model including 1 cyclic/periodic master task, 1 periodic fast task, 16 timer interrupt tasks, 64 I/O interrupt tasks, and 64 interrupt tasks (no auxiliary task).

Can it handle application-specific functions such as counters and time stamping?

Yes. The processor supports application-specific I/O features including counters, high-speed interrupt inputs, serial link functions, and accurate time stamping.

What optional communication modules can be used alongside this processor?

It supports up to 6 optional modules from categories such as Ethernet, Modbus, Modbus Plus, Profibus DP, and Sy/Max, depending on the overall Quantum rack configuration.