Creating Programs - Mitsubishi Electric FX3U-232-BD User Manual

FX Series PLC User's Manual - Data Communication Edition
Non-Protocol Communication (FX
5.

Creating Programs

This chapter explains how to create programs for non-protocol communication type using the 232IF.
5.1 Outline of Communication between FX PLC and 232IF
An FX PLC and 232IF transfer data between each other through the buffer memory (BFM).
5.1.1 For FROM and TO instructions
FX /FX /FX
2N 3U 2NC
Device memory
Data register
D****
Internal relay
M****
•
•
•
•
5.1.2 For direct specification of buffer memory (U\G)
FX and FX
3U 3UC
memory (U  \G  ) using the MOV instruction, etc.
FX /FX
3U 3UC
Device
Direct specification
of buffer memory
U \G
G-14
-232IF)
2N
/FX PLC
3UC
TO instruction
TO instruction
FROM instruction
FROM instruction
PLCs allow not only FROM and TO instructions but also direct specification of the buffer
PLC
Arbitrary applied
instruction
Arbitrary applied
instruction
Arbitrary applied
instruction
Arbitrary applied
instruction
5.1 Outline of Communication between FX PLC and 232IF
FX - 232IF
2N
Buffer memory
Communication
•
format
• Sending command
•
Error reset
Send data
•
•
Receiving completed
• status
Receive data
•
FX - 232IF
2N
Buffer memory
Communication
•
format
• Sending command
•
Error reset
Send data
•
•
Receiving completed
• status
Receive data
•
5 Creating Programs
Communication equipment
Printer
Bar code reader
Communication equipment
Printer
Bar code reader