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7 DATA LINK PROCEDURE
MELSEC-QnA
7.6.2 T-Branch communication specifications list
The following describes the communication specifications for T branch connection.
For communication specifications not listed below, see Section 3.2.
Item Specification Remarks
Transmission speed 625 kbps 156 kbps 10 Mbps, 5 Mbps, and 2.5 Mbps are not allowed.
Maximum length of the main line 100 m (328.1 ft.) 500 m (1640.5 ft.)
Indicates the length of the cable between
terminating resistors. The length of the T branch
cable (branch line length) is not included.
Maximum length of the branch line 8 m (26.25 ft.) Indicates the overall cable length per branch.
Overall branch line length 50 m (164.05 ft.) 200 m (656.2 ft.)
Indicates the overall length of the entire branch
cable.
Maximum number of connected
modules on the branch line
6 stations per branch
The total number of connected stations depends
on the CC-Link specifications.
Connection cable
CC-Link dedicated cable
Version 1.10 compatible CC-Link dedicated cable
• The CC-Link dedicated high-performance cable
cannot be used.
• Mixing of different brands of CC-Link
dedicated cables is not allowed.
• Mixing of different brands of Ver. 1.10
compatible CC-Link dedicated cables is
allowed.
When the hardware version of the master module is as
follows:
AJ61BT11 : Hardware version D or later
AJ61QBT11 : Hardware version D or later
A1SJ61BT11 : Hardware version E or later
A1SJ61QBT11 : Hardware version E or later
Connect the 110
Ω terminating resistor supplied with the
master module.
For connecting, refer to Section 7.5.
• The method of connecting terminating resistors
across DA and DG, and across DB and DG can
be used.
Terminating resistor
(connection method)
When the hardware version of the master module is other
than above:
110 Ω ± 5 %, 1/2 W × 4
(Connect across DA and DG, and across DB and DG)
….both ends
[Connection]
DA
DB
DG
SLD
FG
110
110
• Use a commercially available terminating resistor
of 110 Ω ± 5 % and 1/2 W resistance.
• 110 Ω and 130 Ω terminating resistors supplied
with the master/local modules cannot be used.
T branch terminal block/connector
• Terminal block: Off-the-shelf terminal block
• Connector: Connector for FA sensor (ICE947-5-2)
comparable product is recommended
• When wiring cables for the main line side, try
not to remove the covering as much as
possible.