Schneider 140CFH00800 Analog Input Block

Technical Specifications

Parameter	Value
Brand	Schneider
Model	140CFH00800
Category	Analog Input Block
Weight	0.94 lbs (0.43 kg)
Dimensions	5.6 x 4.2 x 2.8 inches
Component Count	168 discrete components
Input Channels	8 single-ended analog inputs
Input Signal Range	0-10V, 0-5V, 4-20 mA, 0-20 mA
Resolution	15 bits + sign (16 bits total)
Conversion Speed	2.5 ms per channel
Accuracy	±0.2% of full scale
Input Impedance	500 kΩ (voltage), 100Ω (current)
Common Mode Rejection	70 dB minimum
Isolation	1500V AC channel to bus
Operating Voltage	5V DC from backplane
Current Draw	280 mA from 5V bus
Energy Storage	8 x 100µF, 4 x 47µF
Temperature Range	0°C to 60°C

Physical Construction and Component Layout

This 140CFH00800 analog input block measures 5.6 inches in height. Its width reaches 4.2 inches with a depth of 2.8 inches. The total weight comes to approximately 0.94 pounds. Manufacturers placed 168 discrete components on this multi-layer PCB. These components include multiplexers, instrumentation amplifiers, and a high-resolution ADC. The board uses an eight-layer design for excellent noise rejection.

Input Configurations and Signal Flexibility

140CFH00800 provides eight single-ended analog input channels for field devices. Each channel handles voltage signals of 0-10V or 0-5V. Alternatively, each channel accepts current signals of 4-20 mA or 0-20 mA. You can configure each channel independently through software. Voltage mode offers 500 kΩ input impedance for minimal loading. Current mode uses 100Ω impedance for standard loop compatibility. Consequently, this block connects to a wide variety of sensors and transmitters.

Resolution and Conversion Performance

The analog input block delivers 15-bit resolution plus a sign bit. This gives you 16 effective bits of measurement precision. Resolution reaches 0.15 mV for the 0-10V voltage range. For current signals, resolution reaches 0.61 µA per step. Conversion speed reaches 2.5 milliseconds per channel. Total scan time for all eight channels reaches 20 milliseconds. Accuracy stays within ±0.2% of the full scale range. Common mode rejection reaches 70 dB for noise immunity. Therefore, the 140CFH00800 provides high-precision data for critical process control.

Energy Storage and Application Use

140CFH00800 integrates eight 100µF capacitors for input filtering. Four additional 47µF capacitors filter noise near the ADC circuit. The module draws 280 milliamps from the 5V DC backplane. Optical isolation separates each input channel from the internal bus. This isolation withstands 1500V AC for safe field wiring. You will find this block in Modicon Quantum PLC systems. For example, it monitors temperature, pressure, flow, or level signals. The unit operates reliably from 0°C to 60°C ambient.