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The Quantum 140CPU43412A CPU is a single-slot programmable controller with built-in executive memory, application memory and communication ports. All memory components are on board so no additional chips or cartridges are necessary. Quantum CPUs use flash memory technology to support the CPU’s executive memory and instruction set. Flash is a state-of-the-art, nonvolatile memory technology that enables downloadable field upgrades as new features become available. The application program can be stored in either battery-backed RAM and/or Flash RAM. The battery is located on the front of the CPU and can be serviced while the CPU is running. To protect the application program from inadvertent changes during operation, the 140CPU43412A features a memory-protect switch. An LED goes on when this switch is activated. The 140CPU43412A CPU has two Modbus® ports and one Modbus Plus™ port. Simple rotary switches on the back of the CPU are used to set the network address of the Modbus Plus port. Each device on a Modbus Plus network must have a unique address in the range 1 … 64. 5,9