Allen‑Bradley 1746-NI16I is a 16-channel analog current input module for SLC 500 PLC system. It supports 4-20mA, 0-20mA and ±10VDC voltage signals, each channel can be independently configured. It has built-in open wire detection, configurable filter and 16-bit high resolution A/D conversion. It communicates with SLC CPU via backplane bus for collecting process signals such as pressure, flow and level. Widely used in traditional factory automation, water treatment and small process control projects.

ABB PM803F (PN:3BDH000530R1) is the core CPU controller base unit for Freelance AC800F DCS system. Equipped with 32-bit RISC processor and 16MB battery buffered RAM. It executes control logic, handles I/O data exchange and network communication, supports CPU 1:1 hot redundancy, fieldbus and Ethernet communication. The operating system needs to be downloaded separately. Main applications: power plant auxiliary control, chemical, pulp & paper and water industry distributed process control.

Emerson Ovation 1C31122G01 is digital output electronic module (EMOD) for Ovation DCS. It provides 16-channel sinking transistor digital outputs, supports 5~60VDC load driving. It outputs on/off commands to control field relays, solenoid valves and indicator lights, with channel fault diagnosis and short-circuit protection. It must work with matching personality module, widely used in power plant boiler, turbine and safety interlock control.

Emerson Ovation 1C31125G02 is digital output personality module (PMOD) matched with 1C31122G01 EMOD. It serves as signal conditioning and terminal interface assembly, providing field signal marshalling, surge protection and wiring terminals for digital output electronic module. It defines output electrical characteristics and channel configuration, forms complete digital output channel together with EMOD, applied for critical equipment start-stop and interlock logic in power industry Ovation DCS system.