3. Specifications
3.1 Performance specifications
The table below lists the performance specifications of DN91.The table below lists the
performance specifications of DN91.
Item Specifications
Node type
Group 2 dedicated client
Station numbers which can be set
0 to 63
Number of connections which can be
generated
63 connections for I/O communications
63 connections for message communications
Transmitting
2048 points (256 bytes) *2
I/O
communications Receiving
2048 points (256 bytes) *2
Transmitting 240
bytes
R
ate
o
f
com
m
unicat
ions
dat
a
Message
communications Receiving 240
bytes
Communications speed
One speed can be selected from 125kbps, 250kbps, and 500kbps.
Maximum transmitting
distance of trunk line
Length of
drop line
Communications
speed
Thick
Cables
Thick and
Thin
Cables
Thick and
thin cables
coexist
Maximum Total
125
kbaud
500m
156
m
250
kbaud
250m 78m
Com
m
unicat
ions specif
icat
ions
Maximum cable length *1
500
kbaud
100m
100m
See Section
3.1.1
6m
39m
Number of input/output
occupied points
Special 32 points
Internal current consumption
(5V DC)(A)
0.24
Mass(kg)
A1SJ71DN91: 0.23, AJ71DN91: 0.43
*1: The maximum cable length complies with that in the DeviceNet specification (Release 2.0) Volumes 1
and 2.
*2: Up to 255 bytes can be transferred per slave station.
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.
Communications speed
Maximum transmitting distance of trunk line when thick
and thin cables coexit
125kbaud
Thick cable 5
×
Thin cable length 500m
250kbaud
Thick cable 2.5
×
Thin cable length 250m
500kbaud
Thick cable Thin cable length 100m
