Honeywell 620-0024 620 Series PLC 24K Memory Module
Manufacturer: ABB
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Part Number: 620-0024
Condition：New with Original Package
Product Type: PLC Memory Modules
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Country of Origin: Sweden
Payment:T/T, Western Union
Shipping port: Xiamen
Warranty: 12 months
Honeywell 620-0024 620 Series Memory Module
The Honeywell 620-0024 serves as the primary 620-0024 Memory Module utilized to execute non-volatile data storage across Honeywell 620 Series PLC platforms. The hardware plugs directly into the central processing unit backplane to retain user program logic, application configurations, and system registers during power interruptions. It functions via a localized parallel bus architecture to allow rapid read/write execution cycles during cyclic execution tasks.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 620-0024 |
| Brand | Honeywell |
| Origin | USA |
| Weight | 0.476 kg |
| Dimensions | 150 x 110 x 25 mm |
| Operating Temp | 0 to +60 deg C |
| Power Consumption | Powered via internal system bus |
| Memory Capacity | 24K |
| Memory Type | Non-volatile storage (EEPROM / battery-backed RAM) |
| System Compatibility | Honeywell 620 Series PLCs |
| Data Retention Vector | Integrated backup battery |
| Relative Humidity | 5 percent to 95 percent non-condensing |
| Storage Temperature | -20 to +85 deg C |
Process Control & DCS Instrumentation
The memory array incorporates firmware flash compatibility configurations that align with the memory addressing limits of the host processor module. An onboard battery-backed hardware system maintains voltage lines to the volatile portions of the RAM cells immediately upon the loss of the primary backplane bus power supply. The physical PCB trace geometry utilizes dedicated noise-filtering decoupling capacitors to suppress electrical crosstalk and signal attenuation across parallel address lines, protecting registers against corruption caused by localized electromagnetic induction inside the I/O rack.
Frequently Asked Questions
Q: Does the module require an external voltage source to retain the 24K memory block during transit?
A: No. The assembly contains an onboard lithium battery that delivers low-current bias voltage to the RAM cells when the hardware is disconnected from the host PLC backplane bus.
Q: Can this memory module be extracted or inserted while the Honeywell 620 PLC processor is running?
A: No. Remove primary rack power before seating or removing the card. Live insertion alters the impedance profile of the local address bus, which initiates an immediate CPU fault routine and threatens data corruption.
Q: How can a technician verify if the integrated backup battery requires replacement?
A: The host CPU triggers a low-battery diagnostic code on its status display when the cell voltage drops below the predetermined logic threshold, indicating the battery requires service before the next planned power shutdown.
Field Installation Guidelines
Isolate all power sources supplying the controller rack before beginning the mechanical installation process. Align the circuit board module precisely with the card guides in the designated slot of the Honeywell 620 chassis. Press the module inward with uniform pressure until the backplane edge connector seats fully into the internal socket.
Static electricity discharges compromise solid-state components. Technicians must wear a properly grounded ESD wrist strap whenever touching the module surface.
Ensure the physical orientation allows ambient airflow across the face of the card to prevent localized thermal buildup. Label all adjacent field wiring ducts to ensure high-voltage AC cabling runs away from the low-voltage communication paths on the rack assembly.