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Technical Specifications
| Parameter | Value |
|---|---|
| Product Model | 901B-2555-A |
| Manufacturer | Control Technology Inc. (CTI) |
| Product Type | 16-Channel Analog Input Module |
| Compatible Platforms | CTI 2500 Series, SIMATIC 505 I/O Base |
| Input Channels | 16 differential analog input channels |
| Signal Range (Unipolar) | 0 to 5 VDC, 0 to 10 VDC, 0 to 20 mA |
| Signal Range (Bipolar) | -5 to +5 VDC, -10 to +10 VDC, -20 to +20 mA |
| Update Time (No Filtering) | 5.9 ms |
| Update Time (Filtering Enabled) | 8.2 ms |
| DC Input Resistance (Voltage Mode) | 680 kΩ |
| DC Input Resistance (Current Mode) | 250 Ω |
| Repeatability | 0.008% |
| Accuracy (Voltage Mode @ 25°C) | 0.057% of full scale |
| Accuracy (Current Mode @ 25°C) | 0.2% of full scale |
| Resolution (Unipolar) | 14 bits plus sign |
| Resolution (Bipolar) | 13 bits plus sign |
| Common Mode Rejection | >86 dB @ 60 Hz (filtering disabled) |
| Channel-to-Backplane Isolation | 1500 VDC |
| Input Overrange Protection | 500 V |
| Backplane Power Consumption | 5.0 Watts |
| Operating Temperature | 0°C to 60°C |
| Storage Temperature | -40°C to 85°C |
| Agency Approvals | UL, UL-C, FM (Class I, Div 2) |
Main Features and Advantages
High-Density Differential Input Design: The Control Technology 901B-2555-A provides 16 differential analog input channels in a single module, dramatically reducing the hardware footprint and per-point cost in a control rack. This high-density design is especially valuable in data-intensive applications like environmental monitoring, batch processing, or large pumping systems where dozens of temperatures, pressures, and flows must be tracked simultaneously . The differential input architecture delivers 140 VRMS channel-to-channel common mode rejection, effectively suppressing noise from variable frequency drives, motors, and other industrial interference sources.
Exceptional Speed and Accuracy: With a full-channel scan time of only 5.9 ms (no filtering), the Control Technology 901B-2555-A provides near-real-time data to the controller, essential for tight PID loops and fast-responding processes. The module achieves exceptional accuracy of 0.057% of full scale in voltage mode and 0.2% in current mode at 25°C, with repeatability of 0.008% . This level of precision ensures reliable process control and consistent product quality.
Robust Isolation and Protection: The Control Technology 901B-2555-A incorporates 1500 VDC isolation between the field channels and the PLC backplane, safeguarding sensitive control electronics from field wiring surges, ground loops, and transient faults . The module also features 500V input overrange protection, providing an additional layer of defense against accidental wiring errors or voltage spikes.
