Mitsubishi MELSEC Q Series Handbook

2 SERIAL COMMUNICATION MODULE REPLACEMENT
2 - 13
(1) Comparison between A/AnS series and Q series
:Compatible, :Partial change required, ×:Incompatible
*1 On the Q series, this is called "MELSEC communication protocol" (abbrev. "MC protocol").
2.3 Function Comparison
Item
Description
Compat-
ibility
Precautions for replacement
Reference
section
A series AnS series Q series
AJ71UC24
A1SJ71UC24-R2
A1SJ71UC24-R4
QJ71C24N
QJ71C24N-R2
QJ71C24N-R4
Communication
using dedicated
protocol
*1
Device memory
read/write
Programmable controller CPU data is read/written to and
from external devices.
The available commands,
accessible device range, and
access to another station are
restricted.
The program on the external
device side must be changed.
Section
2.6.1
On-demand
Data is transmitted to external devices from the
programmable controller CPU.
Change to a sequence
program that uses the
dedicated instruction
(ONDEMAND).
Non-procedural
communication
Data transmission
Programmable controller
→ External device
Data is transmitted to external devices from the
programmable controller CPU.
Change to a sequence
program that uses the
dedicated instructions
(OUTPUT/INPUT).
Data reception
Programmable controller
← External device
Data is transmitted from external devices.
Bidirectional
communication
Data transmission
Programmable controller
→ External device
Data is transmitted to external devices from the
programmable controller CPU.
Change to a sequence
program that uses the
dedicated instructions
(BIDOUT/BIDIN).
Data reception
Programmable controller
← External device
Data is transmitted from external devices.
Transmission using printer function
Transmits messages (character strings) to the printer from
the programmable controller CPU.
Change to a sequence
program that uses the
dedicated instruction (PRR).
Transmitted by nonprocedural
protocol using user frames.
Transmission
control
DTR/DSR control
Data transmission/reception with external devices is
controlled by RS-232 control signals.
CD signal control
DC code control
DC codes (including Xon/Xoff) are sent/received to control
data transmission/reception with external devices.

Mitsubishi MELSEC Q Series Specifications

General

Brand	Mitsubishi
Model	MELSEC Q Series
Category	Controller
Language	English