Supplying Power To The Slaves; Terminator Connection - Omron C200HW-SRM21-V1 - 08-2007 Operation Manual

Supplying Power to the Slaves

2-2-3

Terminator Connection

System with Distinction
between Main and Branch
Lines
Master
Slave
System with No
Distinction between Main
and Branch Lines
2-3

Supplying Power to the Slaves

A terminator must be connected to the end of the main line opposite the Mas-
ter (the farthest end of the cable) in order to stabilize communications. When
the last Slave in the system is connected to the main line by a T-branch con-
nector, make sure that the terminator is farther from that T-connection than
the Slave so that the terminator is farther from the Master.
The following diagram shows the connections in a typical CompoBus/S Sys-
tem with distinguished main and branch lines. The power supply system has
been omitted.
Slave
Slave Slave
Branches can't
be made from
Slave Slave
branch lines.
A terminator must be connected to the end of the communications cable far-
thest from the Master in order to stabilize communications. When the last
Slave in the system is connected to the communications cable by a T-branch
connector, extend the cable to connect the terminator or connect the termina-
tor at the T-branching position. The cable distance to the terminator includes
the total cable length.
The Slaves must be supplied with power for communications and some
Slaves must have a separate power supply for I/O. The methods for supplying
power to the Slaves depend on the type of communications cable being used.
Slave power
supply
Network 1 For both commu-
power supply
Multiple power 2 For communica-
supply
Local power 1 For both commu-
supply
Slave Slave
Slave
Slave
Main line
Branch line
Usage 2-conductor VCTF
External power sup-
nications and I/O ply (collective supply
possible)
External power sup-
tions ply (collective supply
possible)
For I/O External power sup-
ply (collective supply
impossible)
External power sup-
nications and I/O ply (collective supply
impossible)
Section 2-3
Terminator
≤ 3 m
Branch line L
2
L > L
1 2
Slave
T: T-branch connection
M: Multidrop connection
4-conductor VCTF
cable cable
Special Flat Cable
Power supplied via 4-
conductor VCTF
cable, Special Flat
Cable, or from exter-
nal power source
Power supplied via 4-
conductor VCTF
cable, Special Flat
Cable, or from exter-
nal power source
External power
source
External power
source
31