Original ABB 216EA61B Analogue Input Unit Spare

The Original ABB 216EA61B Analogue Input Unit Spare is a precision A/D conversion module built for the REG216 / REC216 digital generator protection system. It receives stepped-down current and voltage signals from the 216GW61 input transformer module, digitizes them on-board, and forwards the measured values to the processing unit over the B448C parallel bus.

Key Features

• 24 analog input channels, split across two D-sub connectors (a: CH01–CH12, b: CH13–CH24)
• Input range ±40 V, fed from the 216GW61 / 216GW62 input transformer
• On-board 80C186 processor for signal pre-processing
• Local memory: 128 kB EPROM (program), 64 kB RAM, 8 kB EEPROM (data)
• Up to two input transformer modules (216GW61) per 216EA61B
• Self-monitoring: reference voltage check, analog section supply watch, RAM/ROM test
• Plug-in module, 2 standard divisions (2T) wide, for 216MB66 equipment rack

Technical Specifications

Installation Notes

1. Insert the 216EA61B into rack divisions 8–9 or 10–11 on the 216MB66 rack; the B448C bus connector engages at the rear.
2. Connect the analog signal cables from the 216GW61 input transformer module to connectors “a” and “b” — do not wire CT/PT secondary circuits directly to this unit.
3. Verify the 24 V auxiliary supply LED is lit; internal 5 V generation is automatic.
4. Channel assignment and scaling are configured via the portable HMI on the 216VC62a processor, not via on-board switches.
5. On ALARM, check for VREF (reference voltage out of tolerance), ASE (analog section supply failure), or RAM/ROM error in the device status register.

Common Questions

How many analog signals can one 216EA61B measure? The unit has 24 A/D channels, but the usable measurement count depends on the number of 216GW61 input transformer modules connected: one transformer yields 12 signals, two yield 24.

Can I connect 4–20 mA field signals directly? No. This module sits behind the 216GW61 input transformer, which steps down primary CT/PT signals to ±40 V level. It is not a general-purpose 4–20 mA PLC analog input card.

What happens if the reference voltage drifts? The unit flags a VREF status bit (0400 Hex) and raises an ALARM; the protection system treats the affected analog channel as invalid until the fault is cleared.