Input/Output Signal Types And Processing - Mitsubishi Electric M800VW Series Programming Manual

M800V/M80V Series PLC Programming Manual (1/2)
3 Input/Output Signals

3.1 Input/Output Signal Types and Processing

3.1 Input/Output Signal Types and Processing
The input/output signals handled in user PLC are as follows:
 Input/output from/to controller
 Input/output from/to operation board (*1)
 Input/output from/to machine
The user PLC does not directly input or output these signals from or to hardware or controller; it inputs or outputs the signals
from or to input/output image memory. For the reading and writing with the hardware or controller, the controller will perform
the input/output according to the level of the main process or high-speed process.
[Concept of input/output processing]
Controller
Operation
board
Machine
(*1) The operation board here refers to when the remote I/O is installed on the communication terminal.
[Input/output processing conforming to program level]
High-speed processing
input/output
The controller reads the
high-speed input
designation input, and
sets in the image memory.
User PLC high-speed
processing
The controller outputs
the high-speed output
designation output from
the image memory to the
machine.
The table below shows whether or not high-speed input/output can be performed.
[Whether or not high-speed input/output can be performed]
Input signal from control unit
Output signal to control unit
Input signal from machine
Output signal to machine
Input signal from operation board
Output signal to operation board
Input signal from MELSEC when connected to
MELSEC
Output signal to MELSEC when connected to
MELSEC
The operation board here refers to when the remote I/O is installed on the communication terminal.
IB-1501667-B
Input/output
image memory
Controller
(device X, Y)
Main processing
input/output
The controller reads the
input other than the high-
speed input designation, and
sets in the image memory.
User PLC main
processing
The controller outputs
the output other than the
high speed output
designation from the
image memory to the machine.
High-speed input speci-
fication
N/A
N/A
o (2-byte units)
N/A
N/A
N/A
N/A
N/A
User PLC
High-speed output
specification
N/A
N/A
N/A
o (2-byte units)
N/A
N/A
N/A
N/A
16
o: Possible
N/A: Not possible