Chapter Two
Installation
man_105_2.9.doc
Page
15
2.3.4
Multiple Modules
Where more than one module is installed at the one location, a shared power supply and battery
may be used, provided the total load does not exceed the power supply.
The internal power supply of the 105 module can supply a maximum 12V load of 700mA. In order
to achieve this, the input power supply must be above 15VAC or 17VDC. Using these figures, it
can be determined whether there is enough supply for more than one module - allow 100mA for
recharging a battery.
For example, assume there is a 105U-01 module and a 105S-01 module at the same location. The
total I/O at the location is 3 analogue inputs, 6 digital inputs and 4 digital outputs. The total load
will be :-
TYPE OF LOAD
LOAD mA
105U-01 quiescent
70
105S-01 quiescent
45
6 DI @ 10 mA
60
3 AI @ 20mA x 2
120
4 DO @ 25mA
100
Battery charging
100
TOTAL
495
So both modules could be powered from one power supply and one battery, provided the external
supply voltage is more than 15VAC or 17VDC.
2.3.5
24V Regulated Supply
Each 105 module provides a 24V DC regulated supply for analogue loop power, except for 105-4.
The supply is rated at 150mA, and should
only
be used for powering analogue loops.