Description
Honeywell 82408517
Technical Specifications
- Synchronization channels: 2 high-speed redundant sync links
- Sync data refresh rate: 0.5 ms
- Inter-board transfer rate: 50 Mbps
- Synchronized data: I/O image table, PID loop parameters, intermediate variables, alarm status
- Switchover response time: ≤5 ms
- Supply power: 5 V DC supplied by each controller board
- Operating temperature: 0 °C to +60 °C
Functional Features Dual high-speed sync links, real-time I/O table, parameter and variable mirroring between primary and standby units. Automatic bumpless switchover to backup processor on primary CPU failure, communication loss, or watchdog trip. Independent hardware fault detection circuit monitors primary processor operation and sync link integrity. Front panel LEDs indicate primary/standby role, sync link status and fault alarm. Dedicated sync channel transmits state mirror data with hardware error checking. Supports online diagnostic reading of redundancy state and synchronization offset. All switchover events include time-stamped records, uploaded to DCS event logs.
Application Scenarios High-availability safety-related auxiliary control racks in power generation plants Critical pressure and flow regulation control for oil and gas production skids Continuous chemical process closed-loop control requiring zero interruption Unattended remote pipeline monitoring and interlock control systems Spare part replacement for legacy TDC3000 redundant control racks
Performance Parameters
- Switchover output deviation: ≤0.1% of full scale
- Sync link bit error rate: ≤10^-12
- Fault switchover response time: ≤5 ms
- Sync board isolation withstand voltage: 1000 VAC for 1 minute
- Primary/standby role recognition delay: ≤1 ms
Material Composition FR4 high-speed differential PCB substrate FPGA synchronization logic chip High-speed differential line transceivers Gold-plated inter-board connector strips Optocoupler isolation devices TVS surge protection components
Structural Features Matched pair of symmetric PCBs, installed in primary and standby HPM slots respectively. Rear gold fingers mate to the HPM backplane bus. Front high-speed cable interface connects sync links between primary and standby boards. Front panel LEDs distinguish primary mode, standby mode and sync fault. Equal-length differential traces on the board ensure consistent signal delay across sync channels.
Working Principle On rack startup, the two HPM units complete primary/standby role election. The primary controller runs control logic, reads I/O modules and issues output commands. The standby controller mirrors all I/O table values, setpoints and intermediate calculation states continuously through the dedicated sync bus, running the same control program in lockstep without driving output channels. The fault monitor circuit checks primary heartbeat and sync data validity constantly. Once primary failure is confirmed, the standby controller immediately switches to primary role, takes over all I/O bus control and continues control execution without output bump. Sync link disconnection triggers redundancy system alarms.
Installation Requirements Install the two sync boards in corresponding primary/standby HPM slots. Connect dedicated sync flat cables between the two boards, lock all clips. Download identical firmware revision and user program to both controllers. Verify sync link status LED shows normal lock after power-up. Perform forced primary fault test during commissioning to validate bumpless switchover action. Configure DCS alarm logic for redundancy switchover notification to the operator station.
Usage Notes The two sync boards must run identical firmware revision to maintain stable synchronization. Mismatched program files between primary and standby cause sync failure and switchover lockout. Sync cable damage triggers forced switchover events. Do not remove either processor while the rack runs critical continuous production. Wear static protection measures during module handling and replacement. Do not modify onboard FPGA configuration and synchronization circuit components. Switchover events do not clear existing fault conditions originating from field I/O channels.
