Description
1. At-A-Glance Executive Brief
- Model: AAI543-H50/K4A00
- Brand: Yokogawa
- Part Type: 16-Channel Analog Output Module
- Lifecycle Status: Active / FIO Series Support Tier
- System Compatibility: CENTUM CS 3000 & CENTUM VP Field Control Stations (FCS)
- Core Protocol: 4-20 mA DC with HART Digital Communication
2. Technical Introduction
Control loop signal degradation or unexpected channel dropouts can destabilize continuous process loops and force unplanned controller lockouts.
When an output channel fails on a legacy distributed control system rack, technicians need direct-fit hardware that integrates instantly without rewiring field terminations.
The Yokogawa AAI543-H50/K4A00 solves this challenge by providing 16 isolated current output channels configured with standard switch-over redundancy support and pre-terminated KS cable interface adaptability, converting controller data back into precise 4-20 mA control signals with integrated HART diagnostics.
3. Core Technical Specifications
| Parameter | Value |
| Number of Output Channels | 16 channels, isolated |
| Output Signal Range | 4 to 20 mA DC |
| Allowable Load Resistance | 0 to 750 \Omega |
| HART Communication | Supported |
| Withstanding Voltage | 1500 V AC between output and system (1 minute) |
| Circuit-Open Detection | Less than 0.65 mA |
| Output Accuracy | \pm48 \muA |
| Data Update Period | 10 ms |
| Temperature Drift | \pm16 \muA / 10 °C |
| Maximum Current Consumption | 230 mA (5 V DC), 540 mA (24 V DC) |
| Included Termination Adapter | /K4A00 with KS Cable Interface Adapter for AEA4D Terminal Board |
4. Field Engineer’s Tech Notes
- Load Resistance Limits: Verify that total loop resistance, including barriers and field instruments, stays strictly under 750 ohms. Exceeding this limit saturates the internal DAC and causes output current clipping under maximum span conditions.
- Redundant Switch-Over Timing: When deploying this module in a dual-redundant configuration (-5 suffix), note that standard switch-over response permits up to a 100 ms dip below 4 mA during control transfer. Ensure downstream actuators or positioners can tolerate this brief transition window without dropping position.
5. Adaptive QA & Testing Protocol
Every unit undergoes precision current generation testing across all 16 channels using automated multi-meter simulators to verify 4-20 mA span accuracy and signal linearity. Technicians validate open-circuit detection thresholds, HART communication overlay handshakes, and galvanic isolation integrity against the system bus. Complete test logs and verification videos are available upon request prior to dispatch.
6. Buyer’s FAQ
- What condition is this module supplied in?
Inventory is maintained in factory-sealed New Surplus (NSFP) or thoroughly bench-tested refurbished conditions, backed by a standard operational warranty.
- Does the /K4A00 suffix include the interface adapter?
Yes, the hardware includes the factory KS Cable Interface Adapter configured for direct connection to the AEA4D terminal block.
- What is the typical shipping lead time for urgent site requirements?
Standard stock orders process and ship within 1 to 2 business days via global priority couriers to minimize process downtime.
