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104
Wiring CP1L CPU Units
Section 3-4
3.
Relation between current when the PLC is OFF and sensor leakage cur-
rent:
I
OFF
≥
I
leak
Connect a bleeder resistor if I
leak
is greater than I
OFF
. Use the following
equation to calculate the bleeder resistance constant.
R
≤
R
IN
×
V
OFF
/(I
leak
×
R
IN
−
V
OFF
)
Power W
≥
(V
CC
−
V
R
)
2
/R
×
4 (allowable margin)
Vcc: Power voltage
Vr: Sensor output residual current
Von: PLC ON voltage
Iout: Sensor control output (load current)
Voff: PLC OFF voltage
Ion: PLC ON current
Ileak: Sensor leakage current
Ioff: PLC OFF current
R: Bleeder resistance
Rin: PLC input impedance
4.
Precautions on Sensor Inrush Current
An incorrect input may occur due to sensor inrush current if a sensor is
turned ON after the PLC has started up to the point where inputs are pos-
sible. Determine the time required for sensor operation to stabilize after the
sensor is turned ON and take appropriate measures, such as inserting into
the program a timer delay after turning ON the sensor.
Program Example
In this example, the sensor's power supply voltage is provided to input bit CIO
0.00 and a 100-ms timer delay (the time required for an OMRON Proximity
Sensor to stabilize) is created in the program. After the Completion Flag for
the timer turns ON, the sensor input on input bit CIO 0.01 will cause output bit
CIO 100.00 to turn ON.
Output Wiring Precautions
Output Short-circuit
Protection
If a load connected to the output terminals is short-circuited, output compo-
nents and the printed circuit boards may be damaged. To guard against this,
incorporate a fuse in the external circuit. Use a fuse with a capacity of about
twice the rated output.
Connecting to a TTL
Circuit
A TTL circuit cannot be connected directly to a transistor output because of
the transistor's residual voltage. It is necessary to connect a pull-up resistor
and a CMOS IC between the two.
Inrush Current
Considerations
When connecting a transistor or triac output to a load having a high inrush
current (such as an incandescent lamp), steps must be taken to avoid dam-
age to the transistor or triac. Use either of the following methods to reduce the
inrush current.
R
V
R
V
CC
R
IN
Two-wire Sensor
DC Input Unit
TIM
100
#0001
0.00
100.00
0.01
T100
Содержание CP1L-L14D Series
Страница 2: ...CP1L L14D CP1L L20D CP1L M30D CP1L M40D CP1L CPU Unit Operation Manual Revised June 2007...
Страница 3: ...iv...
Страница 9: ...x...
Страница 13: ...xiv TABLE OF CONTENTS...
Страница 21: ...xxii...
Страница 33: ...xxxiv Conformance to EC Directives 6...
Страница 65: ...32 Function Blocks Section 1 5...
Страница 153: ...120 CP CPM1A series Expansion I O Unit Wiring Section 3 6...
Страница 523: ...490 Troubleshooting Unit Errors Section 9 4...
Страница 531: ...498 Replacing User serviceable Parts Section 10 2...
Страница 563: ...530 Auxiliary Area Allocations by Function Appendix C...
Страница 611: ...578 Auxiliary Area Allocations by Address Appendix D...
Страница 638: ...605 Connections to Serial Communications Option Boards Appendix F Connecting to Unit...
Страница 639: ...606 Connections to Serial Communications Option Boards Appendix F...
Страница 669: ...636 Index...
Страница 671: ...638 Revision History...