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Ch a pte r III Ge n e ra l De sc r i p t i o n o f F u n c t i o n B l o c k s
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3．4 APB Input & Output Blocks : Six in total
Table 4: I/O Blocks
Function
Line diagram
Function
Digital input
（IN）
IN
Analog Output
（AO）
Digital output
（OUT）
OUT
Analog Input
（AI）
（
AI
）
Blank Output
（X）
Register D
（D）
Line diagram
AO
（
）
X
（
）
DW
（
）
Input
1. Digital Input (DI)
Digital input is identified by I, M, Q. These identifiers correspond to those used for PLC input, output and
intermediate relays in program.
2. Analog Input（AI）
Analog input is identified by AI, AM, AQ. The DC type PLC input can be programmed as AI input.
Output
1. Digital Output
Digital output is identified by M, Q. These identifiers correspond to those used for PLC output and
intermediate relays in program.
2. Analog Output
Analog output is identified by AO
3. Blank Output
Connect to the output that is not used.
Register D
The timer, counter, and analog values can be output to Register D with property pin, and in the meantime,
the function blocks use the value of Register D as the set parameter for timer, counter and analog.
Note: 1.An error may occur when Register D is used without a value for it.
2. If the function block uses the value of Register D, this value is unable to be modified on the Parameter
Setting interface of APB-LCD.