Put 247 Sensors on One PLC Port with RS485 Daisy Chain
Pressure transmitter solutions for demanding industrial applications. The DR3451 series delivers reliable performance.
At 3 AM, we faced a dilemma in our control room. The rack was teeming with analog input cards, each costing $750 and consuming precious space. We needed to connect over 200 sensors but were running out of slots. Every 4-20mA sensor required its own analog card—expensive real estate for limited points. The physics: each sensor’s analog signal needed a dedicated converter, multiplying cost and complexity.
We installed the DR3451 that night. This RS485 pressure transmitter uses Modbus RTU to daisy-chain up to 247 sensors on a single PLC port. By digitizing the signal at the sensor, we eliminated analog cards, wiring, and terminations. The result: cost per analog point dropped from $750 to under $50.
How It Works
Traditional 4-20mA loops require one analog input card per sensor. The DR3451, a Modbus pressure sensor, converts pressure to digital values and transmits them over RS485. Its multi-drop capability allows 247 devices on one bus, reducing rack space and wiring.
Key Specifications
- Digital RS485 Modbus RTU communication
- Direct PLC connection without analog input card
- Multi-drop capability for up to 247 devices
- High noise immunity
- Digital value transmission
Real Cost Savings
With analog cards at $750 each plus wiring and terminations, a 200-sensor system could cost over $150,000. Using the DR3451 multi-drop pressure transmitter, the same system costs under $10,000—a 93% reduction.
What’s your real cost per analog point including cards, wiring, and terminations? Calculate it, then (https://example.com/dr3451-datasheet) to see how much you can save.
🔧 Need a Reliable Pressure transmitter?
Contact our engineering team for a free consultation on DR3451 solutions tailored to your application.
Tags: #RS485pressuretransmitter #Modbuspressuresensor #multi-droppressuretransmitter #DR3451
