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MELSEC-Q
3 SPECIFICATIONS
3
3 SPECIFICATIONS
3.1 Performance Specifications
This section explains the performance specifications for QJ71DN91, I/O signals for
PLC CPU and specifications for buffer memory.
See the PLC CPU user's manual to be used for the general specifications for
QJ71DN91.
Item
Specifications
Node type
Device net master (Group 2 only client)
Node numbers which can be set
0 to 63
Message connection
63
Number of
connections
that be
created
I/O connection
63 (polling, bit strobe, change of state, cyclic)
Send
Max. 4096 points (512 bytes), max. 256 bytes per 1 node
I/O
communica-
tion
Receive
Max. 4096 points (512 bytes), max. 256 bytes per 1 node
Send
Max. 240 bytes
When
master
function
Amount of
communica-
tion data
Message
communica-
tion
Receive
Max. 240 bytes
Node type
Device net slaves (Group 2 server)
Setting possible node number
0 to 63
Number of
connections
that can be
created
I/O connection
1 (polling)
Send
Max. 1024 points (128 bytes)
When slave
function
Amount of
communica-
tion data
I/O
communica-
tion
Receive
Max. 1024 points (128 bytes)
Communications speed
One speed can be selected from 125 kbps, 250 kbps and 500kbps.
Maximum transmitting distance of
trunk line
Length of drop line
Communic
ations
speed
Thick
Cables
Thin
Cables
Thick and
thin cables
coexist
Maximum
Total
125 kbaud
500 m
156 m
250 kbaud
250 m
78 m
Maximum cable length
500 kbaud
100 m
100 m
See 3.1.1
6 m
39 m
Com
m
uni
c
a
ti
on s
pec
if
ic
at
ions
Current consumption required on the network (A)
0.03
Number of times to write flash ROM
Max. 100000 times
No. of I/O occupied points
32 points (I/O allocation: Intelligent 32 points)
5 V DC internal current consumption (A)
0.17
Weight (kg)
0.11
: The maximum cable length complies with that in the device net specification (Release 2.0) Volumes 1 and 2.
3.1.1 Maximum transmitting distance when thick and thin cables coexist
The table below lists both the maximum transmitting distance when thick and thin
cables coexist.
Communication speed
Maximum transmitting distance of trunk line when thick
and thin cables coexist
125 kbaud
Thick cable 5 Thin Cable length < 500 m
250 kbaud
Thick cable 2.5 Thin cable length < 250 m
500 kbaud
Thick cable length + Thin cable length < 100 m
