Omron 3G8F7-CRM21, User Manual

Page: 226 / 238

206
Wiring for Power Supply
Section E-5
Allowable Current
Restrictions
The total current consumption of all Slave Units must not exceed the allowable
limit for the communications cables and connectors
Allowable Currents for Cables
The communications cable must have a larger capacity than the total current
consumed by all Slave Units.
Allowable Currents for Connectors
The communications power supply connectors on the Master Board and
Repeater Units, as well as Flat Connector Sockets, Flat Connector Plugs, and
Multidrop Connectors have allowable current limits. The current flow on the
points where these connectors are used must not exceed the limits.
Precautions for Correct Use
Exceeding the allowable current limit may result in heat or burnout.
24-VDC
Power
Supply
Slave Unit
current
consumption
I
1
Terminating
Resistor
Slave Unit
current
consumption
I
2
Slave Unit
current
consumption
I
3
Slave Unit
current
consumption
I
n
Flat Connector Plug (5 A max.)
Flat Connector Socket
(5 A max.)
Cable
(a)
Master
Board
Allowable current on the communications cable >= I
1
+ I
2
+ I
3
+....I
n
(The current for the part "a" on the above diagram)
Connector name Model Allowable current limit Remark
Communications
power supply
connectors on
CompoNet Master
Board 3G8F7-CRM21 5A (UL: 4A) Round cable I or II, Flat Cable
I or II
3G8F8-CRM21
Communications
power supply
connectors on
Repeater Units CRS1-RPT01
Flat Connector
Sockets DCN4-TR4
DCN5-TR4
Flat Connector Plugs DCN4-BR4
DCN5-BR4
Multidrop
Connectors DCN4-MD4