Core electrical specifications

Input: 85-264VAC (50/60Hz); 100‑300VDC； Input 90VA (AC)/50W (DC)

Three output channels

+5VDC (Backplane Logic): 15W, supplying CPU, Backplane Bus, and Digital Module Logic

+24VDC isolated IO power supply: 20W, powered by analog modules and sensors

+24VDC relay power supply: 15W, auxiliary power supply for relay output module

Holding time: ≥ 20ms; protection: short circuit, overload, overheating

Indicator light: PWR green=normal; FAULT red=fault/overload

Working temperature: 0-60 ℃; Does not support hot swapping, replacement must be powered off

Typical application scenarios

Scenario 1: Small and medium-sized 90-30 main station (water treatment pump station, sewage substation)

Configuration: IC693PWR321+CPU351+IC693PCM311+IC693MDR390+a small number of analog modules

The number of main substrate modules is not large, and the overall power consumption of the machine is within 30W;

PWR321 provides unified backplane power supply for CPU, PCM coprocessor, and hybrid IO modules; The onboard 24V output directly supplies power to the on-site sensors, reducing the need for external 24V power supply to the control cabinet;

Risk point: If a large number of analog signals and communication modules are added, the total power consumption will exceed the limit, the FAILT red light will turn on, the PLC will randomly crash, restart, and communication will be abnormal (PCM311 communication interruption).

Scenario 2: Single machine PLC control cabinet for building materials and packaging machinery

There are not many IO points for a single device, with 8-10 slots on the main substrate and no expansion rack; PWR321 serves as the sole power source, driving digital input/output and a small amount of analog signals; The relay output module (MDR390) uses a 24V relay power circuit on the power board.

Scenario 3: Main substrate power supply for local sub stations of steel mills/old production lines

90-30 local control main board, without expansion rack; Used for on-site control of fans and pumps; Wide voltage input, suitable for situations with large fluctuations in the factory power grid;