H2U series
Preface
Thank you for purchasing the PLC of Invance control technology co., Ltd.
Before using H2U series PLC, please read this manual carefully in order to use the products correctly.
This manual mainly describes specifications, features and usage of H2U series PLC, and there are PLC
instructions set summaries for easy reference. For both the user program development environment
usage and programming methods of this product,please refer to our company's “Auto-Shop
programming software user's Guide "," H2U series PLC programming reference manual " and " H 2U
series communication manual”.
This manual is subject to change without notice.
Main features of H2U series PLC:
(cid:216) Building-in large program memory space without an external extension memory card, it can up to
24K steps.
(cid:216) Large-capacity power-supply, it can directly provide power to user sensors, HMI, relays, etc.
(cid:216) It provides high-speed，multi-channel and high frequency I/O ports ，as well as excellent operation
and positioning control functions.
iPreface
(cid:216) Building-in two independent communication ports, and MODBUS master and slave
communication protocols,
(cid:216) Comprehensive encryption features to protect user’s intellectual property rights.
(cid:216) Supporting up to 128 programs and 21 sub-interrupt subroutines
(cid:216) Fast user-program execution speed.
iiH2U series
Safety Precautions
Before starting operation, please read the operation instructions and safety precautions in order to
reduce accidents. The "DANGER, WARNING, CAUTION”in the product and product manuals, it does
not mean all safety precautions that should be compliance with, only as additional safety
precautions.Therefore, the personnel who are responsible for product installation must be strictly
trained, strictly adhere to the relevant industry safety specifications and safety precautions in this
manual,and follow the correct operation methods.
This manual classifies the safety precautions into two categories:
DANGER ! CAUTION
and .
DANGER
Indicates that incorrect handling may cause hazardous conditions, resulting in death or severe injury.
! CAUTION
Indicates that incorrect handling may cause the personal injury or property damage.All these are in the
important content, please strictly adhere to them.
Keep this manual in a safe place so that you can take it out and read it whenever necessary. Always
forward it to the end user.
iiiPreface
DESIGN PRECAUTIONS
DANGER
Provide a safety circuit on the outside of the PLC so that the whole system operates to ensure the
safety even when external power supply trouble or PLC failure occurs. To be considered in the design
includes:
1) On the outside of the PLC, an emergency stop circuit, a protection circuit, an interlock circuit, or a
positioning limit circuit may be necessary for preventing damage to the machine.
2) Ensure the safe operation of equipment, please design external protection circuit and safety
mechanics for the PLC output signals.
3) When the PLC CPU detects the system abnormal, all outputs may be turned off. During the controller
circuit failure, it may cause the output out of controlled. Design external circuits to ensure safe
operations of the machine in such a case.
4) When some sort of error occurs in a relay or transistor of the output unit, output may be kept on or
off.
5) PLC design is applied to the indoor electric environment, its power system-level should have
lightning protection device, make sure that they will not lightning imposed on the PLC power input-side
or signal input, control output terminal, avoid damage the device.
ivH2U series
INSTALLATION PRECAUTIONS
! CAUTION
1) Do not use the PLC in the place of dust, oil smoke, conducting dust, corrosive gas, and combustible
gas, exposure to the high temperature, dew, wind and rain, vibration and shock.Electric shock, fire,
operator errors can also cause the product damage and deterioration.
2) When processing for screw holes and wiring, do not make the metal filings and wires falling into the
controller ventilation hole, this may cause a fire, failure, and malfunction.
3) When the installation work of the new PLC is over, it needs to ensure that there is no foreign body on
the face of ventilation, including dust-proof and so on, otherwise, it may cause poor heat dissipation
during running, a fire, failure and malfunction.
4) Avoid charged state for wiring and pluging the cable plug, otherwise easily cause electric shock, or
cause damage to the circuit.
5) The Installation and wiring should be fixed and reliable, poor contact may cause incorrect operation.
6) If there is serious interference, the communications and high-frequency signal cable should be
shielded cables, to improve system anti-interference capacity.
vPreface
WIRING PRECAUTIONS
DANGER
1) Turn off all of the power supply externally before installation or wiring work in order to avoid electric
shock or damage of product.
2) Make sure to attach the terminal cover offered as an accessory to the product before turning on the
power or starting the operation after installation or wiring work.
3) When processing for screw holes and wiring, do not make the metal filings and wires falling into the
controller ventilation hole, this may cause a fire, failure, and malfunction.
! CAUTION
1) For the main unit terminal or the extension unit terminal，do not use external power supply. Do not
wire vacant terminals externally.
2) For applications where serious interference, high-frequency signal input or output cable selection
shielded cables should be to enhance the system of anti-interference capacity.
3) Please use the wire above 2mm2 to avoid connecting the grounding terminal at the same point as a
heavy electrical system.
viH2U series
STARTUP AND MAINTENANCE PRECAUTIONS
DANGER
1) Do not touch any terminal while the PLC is power on.Doing so may cause electrical shock or
malfunctions；
2) Before cleaning or retightening terminals, externally cut off all phases of the power supply.Failure
to do so may expose you to shock hazard.
3) Please connect or remove the wire, the extension module and control unit wire after cutting off all
power supply, otherwise it may cause failures and malfunctions.
4) For online modify, coercible output, RUN, STOP and so on, you should read the instruction manual,

Title: H2U Series Programmable Controller User Manual (English) Description: The "H2U Series Programmable Controller User Manual" is a comprehensive guide designed for users of the H2U series of programmable logic controllers (PLCs) manufactured by our company. This document in English provides detailed information on the hardware setup, configuration, programming instructions, function reference, and troubleshooting procedures specific to the H2U PLC model. It covers topics such as connection diagrams, I/O addressing, ladder logic programming using the manufacturer's proprietary software, communication protocols, safety guidelines, and best practices for integrating the controller into various industrial control systems. By referring to this manual, users will be able to effectively utilize the H2U PLC's features for automating and controlling processes in a wide range of manufacturing, automation, or control applications.