Mitsubishi FX-316

Product Name: Analog Input Special Function Module (MELSEC-FX Series Context)
Product Introduction: Within the Mitsubishi FX family, the FX-316 designation is historically associated with or akin to the FX2N-3A / FX3U-3A-ADP class of hybrid analog modules, though exact “FX-316” is less common than FX3U-4AD. It generally refers to a compact Analog Input unit providing voltage/current sensing for FX-series PLCs.

Category: Others

Description

Technical Specifications (Based on comparable FX Analog modules):
- Input Channels: Typically 2 to 4 channels per module
- Input Ranges: -10 to +10 V DC (200 kΩ input resistance), 4–20 mA / -20 to +20 mA (250 Ω shunt)
- Resolution: 12-bit to 15-bit (depending on FX generation)
- Conversion Speed: ~200–500 µs per channel
- Accuracy: ±0.3% to ±1% F.S. depending on temperature
- Isolation: Photocoupler isolation between bus and analog section; channels usually share a common reference (not channel-to-channel isolated).
Functional Features:
- Digital Filtering: Software-selectable averaging to reduce noise.
- Mixed Mode: Per-channel configuration for voltage or current input.
- Direct Access: Occupies PLC I/O points (e.g., 8 points) or connects via expansion bus.
Structure: Small form-factor block attaching directly to the PLC right-side connector or installed in the expansion cassette; includes precision trim-pots or DIP switches for calibration on some variants.
Application Scenarios: Temperature monitoring (with external transducer), tank level measurement, pressure logging, and analog feedback in small machines.
Notes: When using with FX3G, verify if an FX3G-CNV-ADP or similar interface is required. Ensure analog common (AGND) is properly tied to PLC FG to prevent floating ground measurement drift.

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