Huichuan H3U series PLC

Core Performance and Positioning

H3U is a high-performance small PLC developed by Huichuan for equipment automation and motion control, emphasizing high-speed computing, multi axis control, and multi protocol communication.

Basic instruction speed: 100 ns/instruction

Program capacity: 64 K steps

Working temperature: -20 ℃~+55 ℃ (>40 ℃ requires derating)

Power supply: 85-264 VAC wide voltage

List of internal resources

Quantity of resource types

Auxiliary relay 9216 points

Timer 512 points

Counter 256 points

Data register 9552 points

File register 32768 points

High speed I/O and motion control capability

High speed input

Maximum: 200 kHz

High end models support 3-channel A/B differential differentiation

High speed output

Standard model: 5 channels x 200 kHz

High end sports model: 3 channels x 500 kHz

motor function 

Standard model: 2-axis arc+point interpolation

High end model (0808PRTA): 3-axis point position+spiral interpolation

Exclusive feature: 3-axis electronic cam (flexible configuration)

Communication interface and protocol

Full coverage of commonly used industrial communication, supporting multi machine networking and remote monitoring:

Ethernet: Modbus TCP

RS485×2：Modbus‑RTU

CAN: CANopen/CANlink (proprietary to Huichuan)

USB: Program download and monitoring

I/O expansion capability

Local maximum: 192 DI/DO points, 24 AI/AO channels

Remote maximum: 7936 DI/DO points, 1488 AI/AO channels

Expansion module: Supports up to 16 local extensions and 30 remote modules

Model and Specifications

Model Input/Output High speed Output Type Motion Level

H3U-2416MT-XP 24 16 5 × 200kHz transistor NPN standard 2-axis

H3U-2416MR-XP 24 16 relay free standard 2-axis

H3U-3624MT 36 24 5 × 200kHz transistor NPN standard 2-axis

H3U-3624MR 36 24 without relay standard 2-axis

H3U-0808PMTPA 8 8 3 × 500kHz 4 relays+4 transistors high-end 3-axis

Programming and Software

Standard: IEC 61131-3

Language: Ladder Diagram (LD), Instruction List (IL), Sequential Function Diagram (SFC)

Software: AutoShop (PC programming tool)

Key issues

Question 1: What are the three core differences between the H3U standard model and the high-end sports model (0808PRTA)?

answer:

High speed output: standard for 5-channel 200kHz; The high-end is a 3-channel 500kHz differential output.

Sports function: Standard support for 2-axis interpolation; High end support includes 3-axis interpolation, spiral curve, and electronic cam.

Output type: standard is pure transistor/pure relay; The high-end is a hybrid output of 4 relays and 4 transistors.

Question 2: What are the communication ports of H3U? What protocols do they correspond to? What functions can be achieved?

answer:

Ethernet: Modbus TCP → upper computer SCADA、 Remote monitoring.

Dual RS485: Modbus RTU → Frequency converter, instrument, HMI networking.

CAN: CANopen/CANlink → servo, frequency converter, multi machine linkage.

USB: Program download, online monitoring, debugging.

Question 3: What should be noted when using H3U in high temperature environments (55 ℃)? What are the upper limits for I/O and expansion?

answer:

Attention to use: If the ambient temperature exceeds 40 ℃, the capacity must be reduced, otherwise it will cause overheating protection and output load reduction.

Expansion limit:

Local: Maximum 192 DI/DO points, 24 AI/AO channels.

Remote: up to 7936 DI/DO points, 1488 AI/AO channels.

The maximum number of local expansion modules is 16, and the maximum number of remote modules is 30.