Chapter 14 PLC Function
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C200 Series
14-20
14.5.1 Devices Functions
The Function of Input/output Contacts
The function of input contact X: input contact X reads input signal and enter PLC by connecting with
input equipment. It is unlimited usage times for contact A or contact B of each input contact X in
program. The On/Off of input contact X can be changed with the On/Off of input equipment but can’t
be changed by using peripheral equipment (WPLSoft).
The Function of Output Contact Y
The mission of output contact Y is to drive the load that connects to output contact Y by sending
On/Off signal. There are two kinds of output contact: one is relay and the other is transistor. It is
unlimited usage times for A or B contact of each output contact Y in program. But there is number for
output coil Y and it is recommended to use one time in program. Otherwise, the output result will be
decided by the circuit of last output Y with PLC program scan method.
X0
X10
Y0
Y0
1
2
Y0 is repeated
The output of Y0 will be decided by
circuit
○
2, i.e. decided by On/Off of
X10.
Value, Constant [K] / [H]
K
Decimal
K-32,768 ~ K32,767 (16-bit operation)
Constant
H Hexadecimal
H0000 ~ HFFFF (16-bit operation)
There are five value types for DVP-PLC to use by the different control destination. The following is
the explanation of value types.
Binary Number (BIN)
It uses binary system for the PLC internal operation or storage. The relative information of binary
system is in the following.
Bit
Bit is the basic unit of binary system, the status are 1 or 0.
Nibble
It is made up of continuous 4 bits, such as b3~b0. It can be used to
represent number 0~9 of decimal or 0~F of hexadecimal.
Byte
It is made up of continuous 2 nibbles, i.e. 8 bits, b7~b0. It can used to
represent 00~FF of hexadecimal system.
Word
It is made up of continuous 2 bytes, i.e. 16-bit, b15~b0. It can used to
represent 0000~FFFF of hexadecimal system.
Double Word
It is made up of continuous 2 words, i.e. 32-bit, b31~b0. It can used to
represent 00000000~FFFFFFFF of hexadecimal system.
The relations among bit, nibble, byte, word, and double word of binary number are shown as follows.
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