![background image](http://html.mh-extra.com/html/omron/cp1e-e-d-series/cp1e-e-d-series_user-manual_742511205.webp)
8-37
8 Using Expansion Units and Expansion I/O Units
CP1E CPU Unit Hardware User’s Manual(W479)
8-3 An
alog
I/O U
n
its
8
8-3
-1 CP1W-MAD
11 Analo
g I/O Unit
s
•
If the same power supply is being used by the connected devices and a disconnection occurs at
points A or B in the above diagram, an unwanted circuit path will occur as shown along the dotted line
in the diagram. If that occurs, a voltage of approximately 1/3 to 1/2 of the output voltage of the other
connected device will be generated.
•
If that voltage is generated while the setting is for 1 to 5 V, open-circuit detection may not be possible.
•
If a disconnection occurs at point C in the diagram, the negative (-) side will be used for both devices
and open-circuit detection will not be possible.
This problem will not occur for current inputs even if the same power supply is used.
Additional Information
When external power is supplied (when setting the range code), or when there is a power inter-
ruption, a pulse-form analog output may be generated.
If this causes problems with operation, take countermeasures such as those suggested below.
(1) Countermeasure 1
•
Turn ON the power supply for the CP1E CPU Unit first, confirm correct operation, and
then turn ON the power supply for the load.
•
Turn OFF the power supply for the load before turning OFF the power supply for the
CP1E CPU Unit.
(2) Countermeasure 2
•
Control the machine not only by analog output but also by other signals (additional
start/stop control signal for machine).
3
Create the ladder program.
(1) Allocating I/O Words
Two input words and one output word are allocated to the Analog I/O Unit starting from the
next word following the last word allocated to the CPU Unit or previous Expansion Unit or
Expansion I/O Unit.
(2) Writing the Set Data
Write the set data to word n+1. A/D or D/A conversion begins when the set data is trans-
ferred from the CPU Unit to the Analog I/O Unit. There are five range codes, 000 to 100,
that combine the analog input 0 and 1 and analog output ranges, as shown below.
Range code
Analog input 0 range
Analog input 1 range
Analog output range
000
-10 to 10 V
-10 to 10 V
-10 to 10 V
001
0 to 10 V
0 to 10 V
0 to 10 V
010
1 to 5 V/4 to 20 mA
1 to 5 V/4 to 20 mA
1 to 5 V
011
0 to 5 V/0 to 20 mA
0 to 5 V/0 to 20 mA
0 to 20 mA
100
−
−
4 to 20 mA
Analog I/O Unit
Word m+1
Word m+2
32 inputs
16 outputs
Word n+1
Summary of Contents for CP1E-E**D Series
Page 3: ......
Page 66: ...2 Basic System Configuration and Devices 2 22 CP1E CPU Unit Hardware User s Manual W479...
Page 318: ...Appendices A 54 CP1E CPU Unit Hardware User s Manual W479...
Page 322: ...Index 4 CP1E CPU Unit Hardware User s Manual W479...
Page 324: ...Revision 2 CP1E CPU Unit Hardware User s Manual W479...
Page 325: ......