AutoLog® 20AN RTU Redundant
High-availability RTU · Redundant PLC + I/O · Auto-failover
20AN platform configured for redundant operation: two PLC controllers and duplicated I/O, with automatic failover from active to standby on detected failure. Same on-board I/O density as the standard 20AN (8 DI / 8 DO / 0-8 AI / 0-2 AO) and the same five-card I²C expansion ceiling (72 AI / 34 AO / 72 DI / 72 DO). Communicates over AutoLog WSN radio, Modbus TCP, GSM or TETRA. Web Studio SCADA on the control-room side. Typical deployments: pipeline cathodic protection, wellhead and line-break-valve control, integrated oil & gas SCADA cabinets.
Inputs & outputs (CPU card)
- Analog inputs
- 0–8× 12-bit (0–4000), freely-selectable per point: 4..20 mA, 4..20 mA isolated, Pt100 (−50..150 °C / 0..500 °C / −250..750 °C), KTY10, NTC, 0..2 V, 0..5 V, 0..10 V, ±10 V, 0..5 mA, 0..20 mA, RMS 40 VAC / 25 VAC / 0.25 VAC
- Analog outputs
- 0–2× 12-bit, 0..5 V / 0..10 V
- Digital inputs
- 8× 12/24 VDC, max 8 mA, PNP, opto-isolated
- Digital outputs
- 8× 12/24 VDC, max 2 A (group max 4 A), NPN, opto-isolated
Redundancy
- Operation modes
- Normal or Redundant
- PLC
- Redundant — active PLC switches automatically on failure
- I/O
- Redundant — duplicated I/O paths
I/O expansion (I²C bus)
- Capacity
- Up to 5 expansion cards on the CPU's I²C bus
- Maximum totals
- 72 AI / 34 AO / 72 DI / 72 DO
- I²C port
- Also drives HMI keypad & LCD display
Communication
- Serial ports
- 2× RS232, Modbus RTU master/slave
- OPT1 — Radio modem
- AutoLog WSN, up to ~40 km line-of-sight at 5 W, bands 138-175 / 406-512 / 869-870 / 820-950 MHz
- OPT2 — TCP/IP
- Modbus TCP
- OPT3 — GSM
- GSM GPRS and SMS
- OPT4 — TETRA
- TETRA SDS
Power & data
- Powering
- 12/24 VDC or 10/18 VAC, max 5 VA; voltage-drop alarm
- UPS
- 12 VDC backup with voltage-drop alarm
- Programming
- Remote via radio network, or local via programming cable
- Data logging
- E.g. 16 time-stamped measurements × 3 000 records
Environmental
- Operating range
- −30 to +70 °C
- Storage range
- −40 to +80 °C
- Made in
- Finland