Appendix 7 Differences Between Melsec-Q Series And Melsec Iq-R Series - Mitsubishi Electric MELSEC iQ-R Series User Manual

Appendix 7
The following differences must be addressed when replacing the MELSEC-Q series with the MELSEC iQ-R series
(RJ71LP21-25).
Specifications
Item MELSEC-Q series
System supported
Optical loop system
External power supply Available (QJ71LP21S-25 only)
Network supported
Functions
Item MELSEC-Q series
Parameter unique to the station Enabled
Multiplex transmission function Enabled
Simple redundancy Enabled (High Performance model
QCPU, Process CPU only)
ZNRD/ZNWR instruction No restriction
Differences Between MELSEC-Q Series
and MELSEC iQ-R Series
• Optical loop system
• Coaxial bus system
• Twist bus system
• SI optical fiber cable
• H-PCF optical fiber cable
• Broadband H-PCF optical fiber
cable
• QSI optical fiber cable, 1000m
• GI optical fiber cable (QJ71LP21G
only)
• PLC to PLC network
• Remote I/O network

Appendix 7 Differences Between MELSEC-Q Series and MELSEC iQ-R Series

MELSEC iQ-R series (RJ71LP21-
25)
Optical loop system
• SI optical fiber cable
• H-PCF optical fiber cable
• Broadband H-PCF optical fiber cable
• QSI optical fiber cable
Not available
PLC to PLC network
MELSEC iQ-R series (RJ71LP21-
25)
Disabled
Enabled: Sub-control station, Normal
station
Disabled: Control station
Disabled
An error occurs when RCPU is set as the
target station.
Action
Replacement is not possible when
the system is configured using a
coaxial bus system or twist bus
system. All modules and wiring need
to be replaced.
Replacement is not possible when
the system is configured using GI
optical fiber cable. All modules and
wiring need to be replaced.
Cannot be replaced from the
QJ71LP21S-25.
Cannot be replaced from the remote
I/O network.
Action
Replace assignments of parameters
unique to the station with refresh
parameters. ( Page 188
Replacing a parameter unique to the
station)
Multiplex transmission cannot be
specified when replacing the control
station.
Perform replacement so as to
execute refresh with the program
without making refresh settings. (
Page 188 Method of replacement for
simple redundancy)
Replace with the READ/WRITE
instruction.
APPX
A
187