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337
Appendix E
Precautions When Connecting
Two-wire DC Sensors
When using a two-wire Sensor with a Communications Unit using DC inputs, check that the following condi-
tions have been met. Failure to meet these conditions may result in operating errors.
Relationship between a DC Input-type Communications Unit’s
ON Voltage and a Sensor’s Residual Voltage
V
ON
≤
V
CC
−
V
R
V
CC
:
I/O power supply voltage (The allowable power supply voltage range is 20.4 to 26.4 V, so 20.4 V will
be used here to allow for the worst possible conditions.)
V
ON
:
ON voltage for a Communications Unit with DC Inputs
V
R
:
Sensor's output residual voltage
It is sometimes possible to satisfy the above equation by adjusting the I/O power supply voltage (V
CC
) to
26.4 V.
Relationship between a DC Input-type Communications Unit’s
ON Current and a Sensor’s Control Output (Load Current)
I
OUT
(min)
≤
I
ON
≤
I
OUT
(max.)
I
OUT
: Sensor control output (load current)
I
ON
:
Communications Unit ON current
I
ON
= (V
CC
−
V
R
−
V
F
)/R
IN
V
F
:
Internal residual voltage of a Communications Unit with DC Inputs
R
IN
:
Input impedance of a Communications Unit with DC Inputs
When I
ON
is smaller than I
OUT
(min), connect a bleeder resistor R.
The bleeder resistor constant can be calculated using the following equation.
R
≤
(V
CC
−
V
R
)/(I
OUT
(min.)
−
I
ON
)
Power W
≥
(V
CC
−
V
R
)
2
/R
×
4 [allowable margin]
R
V
CC
V
R
R
IN
2-wire
Sensor
DC Input
Unit
Содержание SMARTSLICE GRT1-DRT
Страница 1: ...OPERATION MANUAL Cat No W455 E1 08 SmartSlice GRT1 Series Slice I O Units ...
Страница 3: ...SmartSlice GRT1 Series Slice I O Units Operation Manual Revised December 2018 ...
Страница 4: ...iv ...
Страница 6: ...vi ...
Страница 20: ...xx EC Directives 6 ...
Страница 62: ...42 Connecting Turnback Cables Section 3 3 ...
Страница 250: ...230 Maintenance Information Window Section 7 3 Maintenance Information Window ...
Страница 292: ...272 GRT1 CP1 L Positioning Unit Section 7 5 ...
Страница 300: ...280 GRT1 END End Unit Section 8 5 Dimensions 11 9 11 9 55 7 1 5 19 5 83 5 2 9 2 9 OMRON ...
Страница 322: ...302 Troubleshooting by Unit Section 9 5 ...
Страница 350: ...330 Explicit Messages Appendix A ...
Страница 354: ...334 Power Consumption and Weight Tables Appendix C ...
Страница 356: ...336 I O Current Consumption Table Appendix D ...
Страница 364: ...344 Revision History ...
Страница 365: ......