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MELSEC-Q
3 SPECIFICATIONS
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
Communication specifications
Current consumption required on the network 0.03 A
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 0.17 A
Weight 0.11 kg
: 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 length + 5 Thin Cable length < 500 m
250 kbaud Thick cable length +2.5 Thin cable length < 250 m
500 kbaud Thick cable length + Thin cable length < 100 m
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