Description
Description
The HE670ADC840 is an 8-channel, isolated analog input module designed for the GE Fanuc Field Control system. This module provides high-precision signal conversion, transforming 4-20mA current loop inputs into 12-bit digital values for processing by the Bus Interface Unit (BIU). Engineered for industrial environments, it features robust electrical isolation to protect sensitive backplane components from field-side electrical noise and surges.
Features
- 8-channel 4-20mA analog input capacity.
- 12-bit resolution for precise signal monitoring.
- High isolation ratings: 400VDC channel-to-channel and 1,000VDC channel-to-bus.
- Compatible with standard Field Control I/O bases for flexible termination.
- Supports hot-swapping on Revision C and higher hardware.
- Input impedance of 100 ohms.
Applications
This module is intended for use in distributed I/O systems where analog process variables (such as pressure, flow, or temperature transmitters) must be interfaced with a PLC or control system. Its high isolation makes it suitable for environments with significant electrical noise or potential ground loops.
Technical Specifications
| Model |
HE670ADC840 |
| Channels |
8 |
| Input Range |
4-20mA |
| Resolution |
12-bits |
| Input Impedance |
100 ohms |
| Channel-to-Channel Isolation |
400VDC |
| Channel-to-Bus Isolation |
1,000VDC |
| Power Consumption |
130mA (from backplane) |
| Operating Temperature |
0 to 75 degC |
| Relative Humidity |
5% to 95%, non-condensing |
Installation Guidelines
- Ensure the system power is disconnected before installing or removing the module unless performing a hot-swap on a supported revision.
- Mount the module securely in the designated Field Control I/O base.
- Use shielded twisted-pair cabling for all analog inputs to minimize EMI/RFI interference.
- Ensure proper grounding of the I/O base to the system ground bus to maintain isolation integrity.
- Avoid routing signal cables in parallel with high-voltage power lines.
- Verify that the module is fully seated in the base to ensure reliable backplane communication.
FAQ
What is the HE670ADC840?
It is a 4-20mA isolated analog input module for Field Control, featuring 8 channels with 12-bit resolution.
What is the HE670ADC840 power consumption?
The module requires 130mA, which is supplied by the backplane.
What is the operating temperature range?
The module operates in temperatures ranging from 0 to 75 degC.
What is the input impedance?
The input impedance is 100 ohms.
