Specifications; Performance Specifications; Maximum Transmitting Distance When Thick And Thin Cables Coexist - Mitsubishi QJ71DN91 User Manual

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
Node type
Node numbers which can be set
Number of
connections
When
that be
created
master
function
Amount of
communica-
tion data
Node type
Setting possible node number
Number of
connections
When slave
that can be
function
created
Amount of
communica-
tion data
Communications speed
Maximum cable length
Current consumption required on the network (A)
Number of times to write flash ROM
No. of I/O occupied points
5 V DC internal current consumption (A)
Weight (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.
125 kbaud
250 kbaud
500 kbaud
3 - 1
Device net master (Group 2 only client)
0 to 63
Message connection 63
I/O connection 63 (polling, bit strobe, change of state, cyclic)
I/O
Send Max. 4096 points (512 bytes), max. 256 bytes per 1 node
communica-
Receive Max. 4096 points (512 bytes), max. 256 bytes per 1 node
tion
Message
Send Max. 240 bytes
communica-
Receive Max. 240 bytes
tion
Device net slaves (Group 2 server)
0 to 63
I/O connection
1 (polling)
I/O
Send Max. 1024 points (128 bytes)
communica-
Receive Max. 1024 points (128 bytes)
tion
One speed can be selected from 125 kbps, 250 kbps and 500kbps.
Communic
125 kbaud
250 kbaud
500 kbaud
0.03
Max. 100000 times
32 points (I/O allocation: Intelligent 32 points)
0.17
0.11
Communication speed
Specifications
Maximum transmitting distance of
trunk line
ations
Thick Thin
speed
Cables Cables
500 m
250 m 100 m
100 m
Maximum transmitting distance of trunk line when thick
and thin cables coexist
Thick cable length + 5 Thin Cable length < 500 m
Thick cable length +2.5
Thick cable length + Thin cable length < 100 m
MELSEC-Q
Length of drop line
Thick and
thin cables Maximum Total
coexist
156 m
See 3.1.1 6 m 78 m
39 m
Thin cable length < 250 m
3 - 1
3