Mitsubishi Electric MELSEC-A Series Manual page 34

1
INTRODUCTION
(c) Coaxial loop system
MELSECNET/10
Coaxial loop
1M
1N 2 Network 1 1N
S
1N
S
(2) Remote I/O network
Pay attention to the following common precautions when replacing remote I/O networks.
Common precautions
1) Modules for remote I/O of the CPU module on each master station
(a) When the Q series CPU module on the master station is used
On the remote I/O network, the MELSECNET/H module and MELSECNET/10 module for A/
AnS/QnA/QnAS series cannot be used in combination. When the master station is replaced
with the Q series modules, replace all remote I/O station with the MELSECNET/H module for
the Q series.
(b) When the AnU(S)/QnA(S) series CPU module on the master station is used
On the remote I/O network, the MELSECNET/H module for the Q series and MELSECNET/10
module for the A/AnS/QnA/QnAS series can be used in combination using MELSECNET/10
mode.
Remote master station
AnU(S)/QnA(S)CPU
MELSECNET/10 module
for A/AnS/QnA/QnAS series
Q series CPU module
MELSECNET/H module for Q series
*1 Modules with a serial number (first five digits) of "15012" or later
1) When replacing a multiplex master system, select Q12PHCPU, Q25PHCPU, Q12PRHCPU, or
Q25PRHCPU as the CPU module.
2) When replacing a parallel master system, build a separate network having a different network No.
1
- 17
MELSECNET/H
Coaxial bus
1
P
1M 1
P
4
S
1N
3
Remote I/O station
MELSECNET/10 module
for A/AnS/QnA/QnAS series
+
+
System configuration precautions
The following item is provided in addition
to common precautions (1) described on
the previous page.
• Overall distance: If this value exceeds
the Q series specification value when
the MELSECNET/10 system cables are
re-used, measures (e.g. adding a
repeater unit) are required.
Network 1
• Number of stations: When 64 modules
are connected, measures (e.g. dividing
2 1N 3 1N 4
S S S
into two or three networks of 32 modules
or less having a different network No.)
are required.
• Duplex loop: When the transmission
path has to be duplexed, changes to an
optical loop system, etc. are required.
: Connection allowed, ×: Connection not allowed
×
MELSECNET/H module
for Q series
*1
(MELSECNET/10 mode)
(MELSECNET/H mode)