Connecting The Slice I/O Terminal Power Supply - Omron GRT1 - 11-2007 Operation Manual

Power Supply Wiring
3-2-1

Connecting the Slice I/O Terminal Power Supply

Evaluating the Power
Supply Requirements
Unit Power Supply
1,2,3...
Note
I/O Power Supply
1,2,3...
Note
The Communications Unit has two sets of power supply terminals for the fol-
lowing two systems.
Power supply
terminals
Unit power supply These terminals supply power to the Communications Unit's
terminals internal circuits as well as the connected Slice I/O Units' inter-
nal circuits (supplied through the Slice bus).
I/O power supply ter- These terminals supply power to the external I/O that is con-
minals nected to the Terminal's Slice I/O Units.
The maximum power consumption for a Slice I/O Terminal is 80 W per block.
1. Calculate the power consumption of all of the Slice I/O Units connected to
the Communications Unit.
2. If the power consumption exceeds 80 W, mount a Right Turnback Unit
(GRT1-TBR) on the Slice I/O Unit at the point where the power consump-
tion is less than 80 W.
3. Connect the 24 VDC Unit power supply to the Left Turnback Unit (GRT1-
TBL).
Power Consumption of Slice I/O Units
For details on the power consumption of the various Slice I/O Units, refer to
Appendix C Power Consumption and Weight Tables.
(1) There is a small amount of electrical resistance in the connections be-
tween the Slice I/O Units. This can result in a voltage drop of up to 2 V
when 64 Slice I/O Units are connected at 4 A. Consider this voltage drop
when designing the system.
(2) When dividing the power supply, always wire (supply) the power from the
same power supply. (Refer to the following wiring example.)
The maximum I/O current consumption is 4 A.
1. Calculate the total current consumption used by all external I/O of the con-
nected Slice I/O Units (including other Units such as Turnback Units, but
excluding the GRT1-OD4G-3, which has a separate I/O power supply con-
nection).
2. If the current consumption exceeds 4 A or you want to provide separate
systems for inputs and outputs, divide the Slice I/O Units at the desired
point with a GRT1-PD2, GRT1-PD2G, GRT1-PD8 or GRT1-PD8-1 I/O
Power Feed Unit, and provide a separate external I/O power supply.
3. It is also possible to provide a separate external I/O power supply at a Left
Turnback Unit (GRT1-TBL).
I/O Current Consumption of Slice I/O Units
For details on the I/O current consumption of the various Slice I/O Units, refer
to Appendix D I/O Current Consumption Table.
(1) Always use isolated power supplies for the power supplies.
(2) Power is not supplied through the GCN2-100 Turnback Cable. (Refer to
the following wiring example.)
Section 3-2
Description
37