YOKOGAWA AIP171

Description

• Model:​ AIP171
• Manufacturer:​ Yokogawa Electric Corporation
• Product Type:​ 16-channel isolated analog input (AI) module
• Input Signal:​ 4–20 mA DC (default), configurable to 1–5 V DC
• Number of Channels:​ 16, each independently isolated
• Resolution:​ 16-bit Σ-Δ ADC
• Accuracy:​ ±0.1 % of span (typical; ±0.05 % referenced in detailed technical data)
• Common-Mode Rejection Ratio (CMRR):​ > 120 dB at 50/60 Hz
• Isolation Voltage:​ ≥ 500 V AC RMS between channels and system side (channel-to-channel ≥ 250 V AC RMS)
• HART Support:​ Native HART pass-through, HART Revision 5/6/7, per channel
• Sampling Period:​ Min. 100 ms (configurable via FCS control cycle)
• Power Supply:​ Via I/O backplane (from power module such as AEP811)
• Status Indication:​ Per-channel dual-colour LED (green = normal, red = fault/over-range/open wire)
• Protection:​ Input over-voltage protection, reverse polarity protection, surge suppression
• Operating Temperature:​ 0 °C to +60 °C
• Compatible Base:​ AIB171 (standard) or AIB171-S (enhanced diagnostics)
• Certifications:​ CE, UL 61010-1, IEC 61326, ATEX (optional), SIL 2 capable with proper system architecture
• Hot Swap:​ Supported in redundant FCS configurations

• 16 channels of fully independent galvanic isolation — eliminates ground-loop interference and cross-talk in multi-ground systems
• Native HART multiplexing — no external HART modem needed; directly access transmitter diagnostics from the control room via PRM or AMS
• ±0.1 % measurement accuracy ensures reliable input data for Advanced Process Control (APC) and “edge control” strategies
• High CMRR (> 120 dB) rejects EMI from variable-frequency drives and large motors
• Hot-swappable in redundant configurations for uninterrupted operation
• SIL 2-capable when deployed within a certified safety system architecture
• Seamless integration with CENTUM VP — channel alarms, over-range and HART health map automatically to the HIS operator station

• Insert the module into the correct I/O slot of the CENTUM FCS rack fitted with an AIB171 or AIB171-S base
• If the system does not support hot swap, power down the FCS before installing or removing the module
• Use shielded cable for 4–20 mA signal wiring; connect shield to the designated ground point
• Properly terminate unused input channels to avoid floating voltages
• For HART communication, ensure the FCS and PRM/AMS configuration enable HART pass-through on the relevant channels

• Verify the channel configuration (current vs. voltage) matches the field transmitter output type
• Periodically review HART device diagnostics via Plant Resource Manager to anticipate maintenance needs
• In redundant FCS architectures, both modules should be of the same firmware revision to ensure seamless failover
• When used in SIL 2 applications, the overall safety loop must be validated according to IEC 61508/61511 requirements
• Inspect terminations and shield grounding during scheduled maintenance to preserve signal integrity