Do-more T1H Series PLC Hardware User Manual, 1st Edition, Rev. C
4–6
Chapter 4: Specifications - Terminal Bases and Power Supplies
Calculating the Power Budget
Managing the Power Resource
When determining the types and quantity of I/O modules to be used in the Do-more T1H
Series PLC system, it is important to remember there is a limited amount of power available
from the power supply. A chart is provided to help you easily see the amount of power
available with AC and DC power supplies. At the end of this section you will also find an
example of power budgeting and a worksheet showing sample calculations.
If the chosen I/O exceeds the maximum power available from the power supply the problem
is corrected by simply adding another power supply .
WARNING: It is extremely important to calculate the power budget correctly. If you exceed the power
budget, the system may operate in an unpredictable manner which may result in a risk of personal
injury or equipment damage.
Power Supply Specifications
The following chart shows the amount of current
supplied
by the Terminator I/O power
supply. Use this to calculate the power budget for your system. The Auxiliary 24V Power
Source mentioned in the table can be used to power field devices or modules that require an
external 24VDC.
Note
A max. of 500mA @ 24VDC can be achieved by lowering the 5VDC to 1500mA.
NOTE:
Important about Power Supplies
- One power supply is required in the leftmost component position (Power
Supply #1), as shown above. Additional power supplies should be added between I/O modules as necessary to
meet power budget requirements. Each power supply powers the modules to its right, but is interrupted by the
next power supply. It is not mandatory to have a power supply in the leftmost position on an expansion rack.
The system shown above:
Power Supply #1 powers the CPU module and the two I/O modules to its right.
Power Supply #2 powers the remaining five I/O modules. This is only an example and the power budget
requirements vary depending on the I/O modules used.
USB
PGM
PORT
RUN
I/O
ERR
USB
TX
RX
TERM
RUN
STOP
T1H-DM1E
Power Supply #1
Power Supply #2
AC Power
Supply
5VDC Current
Supplied in mA
(Internal)
Auxiliary
24VDC Power
Source Current
Supplied in mA
DC Power
Supply
5VDC Current
Supplied in mA
(Internal)
Auxiliary
24VDC Power
Source Current
Supplied in mA
T1K-01AC
2000
300
T1K-01DC
2000
-
T1K-01AC (see Note)
1500
500
