Mitsubishi MELSEC Q Series Handbook

2 SERIAL COMMUNICATION MODULE REPLACEMENT
2 - 2
2.2.1 Module performance comparison
(1) Comparison between A series and Q series
:Compatible, :Partial change required, ×:Incompatible
*1 On the Q series, this is called "MELSEC communication protocol" (abbrev. "MC protocol").
*2 When the AJ71UC24 uses only the RS-232 channel, it can be replaced with the QJ71C24N-R2.
When the AJ71UC24 uses only the RS-422 channel, it can be replaced with the QJ71C24N-R4.
2.2 Performance Specifications Comparison
Item
Specifications
Compat-
ibility
Precautions for replacement
A series Q series
AJ71UC24
QJ71C24N
*2
Interface
RS-232
RS-232 compliant
(D-Sub 25P)
RS-232 compliant
(D-Sub 9P)
The connector on the
connection cable must be
changed.
RS-422/485 RS-422/485 compliant
RS-422/485 compliant
(2-piece terminal block)
Wiring must be changed.
Communication
method
Communication
using dedicated
protocol
*1
Half-duplex communication
Non-procedural/
bidirectional
communication
Full duplex communication (1:1 connection)/
Half-duplex communication (1:n, m:n connection)
Synchronization method Start stop synchronization (asynchronous method)
Transmission speed 300 to 19200 bps 50 to 230400 bps
Data format
Start bit 1
Data bit 7 or 8
Parity bit 1 (vertical parity)/none
Stop bit 1 or 2
Access cycle
Communication
using dedicated
protocol
One request is processed when the mounted station programmable
controller CPU executes END processing.
Non-procedural/
bidirectional
communication
Transmission can be executed at each send request,
and reception is available at all times.
Error
detection
Parity check Performed (odd/even)/none
Sum check Performed (MC protocol/Bidirectional)/none
Transmission control
Line
configuration
(connection)
RS-232 1:1
RS-422/485
1 :1, 1 : n, m : n
(n:max. 32, m+n:max.32)
Line
configuration
(data
communication)
Communication
using dedicated
protocol
1:1, 1:n, m:n
(n:max.32, m+n:max.32)
For details on linked operation
between interfaces, refer to
the manual.
Non-procedural
communication
1:1, 1:n (n:max.32)
1:1, 1:n, n:1 (n:max.32)
Bidirectional
communication
1:1
Transmission
distance
RS-232 Max.15m
RS-422/485
Max.500m
(overall distance)
Max.1200m
(overall distance)
No. of E
2
PROM writes
No. of flash ROM writes
Max. 100,000 times on same
area in E
2
PROM
Max. 100,000 times on same
area in flash ROM
No. of occupied I/O points
32 points/slot
(I/O assignment: special 32
points)
32 points/slot
(I/O assignment: intelli. 32
points)
DTR/DSR (ER/DR) control
CD signal control
DC1/DC3 (Xon/Xoff) control
DC2/DC4 control
RS-232
Available
Available
Available
RS-422/485
N/A
N/A
Available

Mitsubishi MELSEC Q Series Specifications

General

Brand	Mitsubishi
Model	MELSEC Q Series
Category	Controller
Language	English