LX3V Series PLC programming manual
- 1 - WECON technology Co., Ltd.
Content summary
This manual has a comprehensive introduction to the basic functions of WECON PLC
Editor and the actual use. This book is completely aimed at zero-based readers, is an
essential reference book for entry-level readers to quickly and fully grasp WECON PLC
and WECON PLC Editor.
This book starts from the basic product of WECON PLC and the basic concept and
operation of WECON PLC Editor. It combines with a large number of cases and
graphic analysis to comprehensively and deeply explain the use of WECON PLC Editor
Software, as well as PLC program.
WECON technology Co., Ltd. All rights reserved.
LX3V Series PLC programming manual
- 2 - WECON technology Co., Ltd.
Safety Precautions
Before installation, operation, maintenance or inspection of this product, thoroughly
read through and understand this manual and all of the associated manuals. Also,
take care to handle the module properly and safely.
1) Design precautions
Make sure to have the following safety circuits outside of the PLC to ensure safe
system operation even during external power supply problems or PLC failure.
a) An emergency stop circuit, a protection circuit, an interlock circuit for opposite
movements, and an interlock circuit (to prevent damage to the equipment at the
upper and lower positioning limits).
b) Note that when the PLC CPU detects an error, such as a watchdog timer error,
during self-diagnosis, all outputs are turned off. Also, when an error that
couldnot be detected by the PLC CPU occurs in an input/output control block,
output control may be disabled. External circuits and mechanisms should be
designed to ensure safe machinery operation in such a case.
c) Note that when an error occurs in a relay or transistor output device, the output
could be held either on or off. For output signals that may lead to serious
accidents, external circuits and mechanisms should be designed to ensure safe
machinery operation in such a case.
2) Installation precautions
a) Use the product within the generic environment specifications described in this
manual.
Never use the product in areas with excessive dust, oily smoke, conductive dusts,
corrosive gas, flammable gas, vibration or impacts, or expose it to high
temperature, condensation, or rain and wind. If the product is used in such
conditions, electric shock, fire, malfunctions, deterioration or damage may occur.
b) When drilling screw holes or wiring, make sure that cutting and wiring debris do
not enter the ventilation slits. Failure to do so may cause fire, equipment failures
or malfunctions.
c) Connect the expansion module, expansion board and cable securely to their
designate connectors. Loose connections may cause malfunctions.
To prevent temperature rise, do not install at