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HOME ⊙ AB ⊙ Allen Bradley 1746-NI8 Analog Input Module Application Case
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Allen Bradley 1746-NI8 Analog Input Module Application Case

来源: | 作者:FAN | 发布时间 :2025-09-01 | 215 次浏览: | Share:

Constant on/off channel not enabled. Set bit 11=1 in the configuration word to enable channel

（2） Common troubleshooting

Open circuit error: Only 4-20mA channel, check for sensor disconnection, loose terminals, response time ≤ 6ms (8-channel full configuration).

Over range error: Input signal exceeds the configured type range (such as 4-20mA channel input<3.5mA or>20.5mA), calibrate sensor or adjust configuration.

Configuration error: The configuration word position setting is invalid (such as setting the data format to 110), and the configuration word needs to be redefined.

Noise interference: If the analog signal fluctuates greatly, check the shielding grounding, stay away from the power line, or reduce the filtering frequency (if set to 1Hz).

（3） Spare parts and support

Replaceable spare parts: terminal block (1746-RT25G), terminal cover (1746-R13), manual (1746-6.8);

Technical support: Module fault symptoms, LED status, image data, processor model and firmware version are required. Contact Allen Bradley customer service (Americas: 1-888-565-4155; Europe:+800-44444-8001; Asia:+86-400-842-8599).

Application examples

Provide two practical cases covering both basic and advanced scenarios:

Basic case: Monitoring single-phase motor current, 4-20mA signal corresponding to 0-100A, channel 0 set as engineering unit+10Hz filtering, program converts data into BCD format to drive LED display screen (TOD command required).

Advanced case: Multi parameter monitoring (three-phase motor current, tank pressure, liquid level), switching the display current phase sequence through a selection switch, triggering high and low level alarms when the liquid level exceeds the limit, and configuring different input types (current/voltage) for each of the 5 channels.


Technical Specifications

Electrical input channel: 8 channels (backplane isolation); Input impedance: 1M Ω; A/D conversion: successive approximation method; Common mode rejection ratio: DC ≥ 75dB, 50/60Hz ≥ 100dB; Accuracy: Voltage ± 0.1%, current ± 0.05% (0-60 ℃)

Physical dimensions: 127mm × 89mm × 152mm; weight: approximately 454g; protection level: IP20; Terminal: 18 positions detachable

Environmental working temperature: 0-55 ℃ (conventional slot), 0-60 ℃ (rightmost slot); Storage temperature: -40-85 ℃; Humidity: 5% -95% (without condensation); Hazardous Area Certification: Class I Division 2

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