The Main Unit of VSM-14M is not equipped with the module expansion slot, cannot be connected with any
module or special module.
The Main Unit of VS2, VSM or VS3 equips a module expansion slot, could connect with DIO expansion modules and
special modules. (excluded the VSM-14M)
The Main Unit of VS2 or VSM can use expansion modules to handle up to 128 inputs (X0~X177) and 128 outputs
(Y0~Y177), total 256 I/O points. And also available 8 special modules.
The Main Unit of VS2, VSM or VS3 will occupy the assigned numbers X0~X17 and Y0~Y17, thus the beginning I/O
address of the rst expansion unit/module are the X20 and Y20.
The Main Unit of VS3 can use expansion modules to handle up to 256 inputs (X0~X377) and 256 outputs
(Y0~Y377), total 512 I/O points. And also available 16 special modules.
Notes for VS2, VSM and VS3 Series PLCs module expansion.
X0 X17 X20 X30
Y0 Y17
Y20
The VS-8XY module occupies 8 input points and 8 output points.
The VS-28XYR expansion module will occupy 16 input and 16 output points. Besides, it is unable to expand any
module on its right side.
All the Special and DIO Expansion Modules are serial connected on the right side of the Main Unit, and the
st.
connection sequence is without reserved. The closest Special Module is designated as the 1 Special Module.
nd.
After that, the followed Special Module is the 2 , and so on. But, the DIO Expansion Module will not interfere with
the ranking of Special Modules.
st.
The 1 Special Module
The VS Main Unit has the circuit for inner power supplying but the expanded modules and cards do not have, all
power is from the Main Unit Please be aware of power consumption. If the inner power is insufficient, add the VS-PSD
power repeater module is required.
For the power consumption calculations of individual expansion modules and expansion cards, please refer to
“1-8 Specifications of Power Supply” in the Product Manual.
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