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WB-MAI11 Modbus Analog Inputs/en: различия между версиями
WB-MAI11 Modbus Analog Inputs/en (просмотреть исходный код)
Версия 14:47, 19 июля 2019
, 4 года назадНовая страница: «=== Possible combinations of sensors to a single login === Two sensors can be connected to the same input with the following restrictions: * If the channel INxP /…»
(Новая страница: «== Connection diagrams == The module is made in a plastic case and is designed for installation in a mounting box on a DIN rail.File:MAI Diff Voltage.png|mini|F…») |
(Новая страница: «=== Possible combinations of sensors to a single login === Two sensors can be connected to the same input with the following restrictions: * If the channel INxP /…») |
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| Строка 115: | Строка 115: | ||
Fig. 8 shows a diagram of the resistance measurement using the current measurement. This circuit is used to connect an NTC thermistor. In this mode, the device can measure resistance in a wide range - from 150 Ohms to 1 MW. But keep in mind that the lower the resistance of the NTC, the greater the current in the circuit and self-heating NTC (as opposed to the circuits in Fig. 5 and Fig.7, where the current in the circuit is constant regardless of resistance). Therefore, the device artificially reduces the input polling rate depending on the current NTC resistance to compensate for self-heating. It is possible to connect two NTC to one input, but in this case, the polling rate is reduced, because during the survey of one, the current goes through both NTC, which leads to an increase in idle time to compensate for self-heating. To improve the accuracy of high resistance measurements, it is recommended to select the lowest possible data rate - 20 SPS. | Fig. 8 shows a diagram of the resistance measurement using the current measurement. This circuit is used to connect an NTC thermistor. In this mode, the device can measure resistance in a wide range - from 150 Ohms to 1 MW. But keep in mind that the lower the resistance of the NTC, the greater the current in the circuit and self-heating NTC (as opposed to the circuits in Fig. 5 and Fig.7, where the current in the circuit is constant regardless of resistance). Therefore, the device artificially reduces the input polling rate depending on the current NTC resistance to compensate for self-heating. It is possible to connect two NTC to one input, but in this case, the polling rate is reduced, because during the survey of one, the current goes through both NTC, which leads to an increase in idle time to compensate for self-heating. To improve the accuracy of high resistance measurements, it is recommended to select the lowest possible data rate - 20 SPS. | ||
=== | === Possible combinations of sensors to a single login === | ||
Two sensors can be connected to the same input with the following restrictions: | |||
* | * If the channel INxP / off, channel, INxN should also be turned off | ||
* | * If the channel INxP has a differential type configuration for channel INxN ignored | ||
* | * Channel INxN may not have a differential type | ||
* | * If the INxP channel is set to current measurement mode, the INxN channel must also be set to current measurement or disabled | ||
* | * If the INxP channel is set to resistance or voltage measurement mode, the INxN channel must also be set to resistance or voltage measurement | ||
* | * If the channel is configured to INxP mode of resistance measurement using the current measurement, and the channel INxN also have this mode or turned off | ||
Channel settings INxP override the channel settings INxN. If the above conditions are not met, the INxN channel settings are ignored and the channel is disabled. Table 2 shows the possible sensor combinations for a single input. | |||
{| class="wikitable" | {| class="wikitable" | ||
|+ | |+Table 2. Possible combinations of sensors to one input. | ||
! rowspan="2" | | ! rowspan="2" |inxp channel connection Diagram | ||
! colspan="8" | | ! colspan="8" |Possible inxn circuit | ||
|- | |- | ||
| | |Figure 1 | ||
| | |Figure 2 | ||
| | |Figure 3 | ||
| | |Figure 4 | ||
| | |Figure 5 | ||
| | |Figure 6 | ||
| | |Figure 7 | ||
| | |Figure 8 | ||
|- | |- | ||
| | |Figure 1 | ||
The measurement of the voltage in differential mode | |||
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| Строка 149: | Строка 149: | ||
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|- | |- | ||
| | |Figure 2 | ||
Voltage measurement | |||
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!V | !V | ||
| Строка 160: | Строка 160: | ||
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|- | |- | ||
| | |Figure 3 | ||
Current measurement | |||
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| Строка 171: | Строка 171: | ||
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|- | |- | ||
| | |Figure 4 | ||
The connection of the thermocouple | |||
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| Строка 182: | Строка 182: | ||
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|- | |- | ||
| | |Figure 5 | ||
Connection of "dry contact" sensors and resistance measurement according to two-wire scheme | |||
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!V | !V | ||
| Строка 193: | Строка 193: | ||
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|- | |- | ||
| | |Figure 6 | ||
Connection of ratiometric sensors | |||
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!V | !V | ||
| Строка 204: | Строка 204: | ||
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|- | |- | ||
| | |Figure 7 | ||
Resistance measurement by three-wire circuit | |||
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| Строка 215: | Строка 215: | ||
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|- | |- | ||
| | |Figure 8 | ||
Resistance measurement using the current measurement | |||
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