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YOKOGAWA AFG84D-H4123 Field Control Unit
Configured for high-availability process control in CENTUM VP and CS 3000 systems, the YOKOGAWA AFG84D-H4123 (AFG84D Field Control Unit) provides direct physical and logical execution of control algorithms through dual-redundant processing pathways.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | AFG84D-H4123 |
| Brand | YOKOGAWA |
| Origin | Japan |
| Weight | 0.8 kg |
| Dimensions | 482.6 mm x 310 mm x 265 mm |
| Operating Temp | 0 deg C to 50 deg C |
| Power Consumption | 250 VA |
| Redundancy | Duplex (CPU, Power, Bus) |
| Failover Time | < 10 ms |
| Isolation | >= 500 VDC channel-to-channel |
DCS Process Control and Connectivity
The AFG84D-H4123 architecture utilizes a 4-20 mA HART loop protocol to facilitate bidirectional communication between field instrumentation and the Vnet/IP control network. The module ensures deterministic loop execution by isolating field-side signals through 500 VDC channel-to-channel isolation barriers. When integrated into the control hierarchy, the unit manages synchronization between redundant CPU pairs, maintaining consistent scan cycles and I/O image updates across the primary and standby processors.
Frequently Asked Questions
Q: Does the AFG84D-H4123 support live insertion and removal of power supply modules?
A: Yes. The power supply units are designed for hot-swapping under normal load conditions. The internal circuitry limits inrush current to 30 A for a duration of 50 ms to prevent voltage sag on the common backplane during installation.
Q: How is the failover logic synchronized during a CPU fault?
A: The system utilizes a dedicated high-speed bus to mirror memory states between the primary and standby CPUs. Upon detection of a processor hang or hardware fault, the secondary CPU assumes bus mastership within a failover window of less than 10 ms, ensuring the control process remains uninterrupted.
Field Installation Guidelines
- Rack Mounting: Secure the unit within a standard 19-inch industrial rack using all four chassis mounting points. Ensure that internal cooling fans remain unobstructed to maintain the operational temperature range of 0 deg C to 50 deg C.
- Shielding: Terminate all analog signal cable shields to the cabinet ground bus bar at the entry point. Avoid routing high-voltage power cables in the same wireway as the Vnet/IP communication bus to prevent electromagnetic interference.
- Grounding: Verify that the chassis frame establishes a low-resistance connection to the station earth ground. This prevents potential drift in the 4-20 mA measurement accuracy caused by ground loops or transient common-mode voltages.
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