This memory board module stores user programs and system configuration data securely. It provides non-volatile storage for Honeywell Series 620 PLC controllers. You can install this board directly into the processor rack slot. The unit retains all data even after a complete power loss.
Technical Specifications & Key Parameters
| Parameter | Detail |
|---|---|
| Product Model | Honeywell 620-0020 |
| Category | Memory Board Module |
| Dimensions (L x W) | 230 mm x 160 mm |
| Weight | 0.32 kg (0.71 lbs) |
| Memory Type | CMOS RAM with lithium battery backup |
| Storage Capacity | 32 kB (expands PLC program and register storage) |
| Number of ICs | 4 memory chips, 1 address decoder, 6 capacitors |
| Energy Storage | Lithium battery (BR-2/3A, 3V, 1200 mAh) |
| Battery Life | 5 years typical under normal operation |
| Backup Capacitors | Six 100 µF capacitors (hold-up during battery change) |
| Data Retention | Unlimited with battery, 15 seconds without battery |
| Operating Voltage | 5V DC from backplane |
| Current Draw | 150 mA at 5V DC |
| Connector Type | One 40-pin edge connector |
| Write Protection | Hardware jumper (prevents accidental overwrites) |
| Status LED | Battery low indicator (amber) |
Detailed Feature Overview
Honeywell 620-0020 adds 32 kB of non-volatile memory to your PLC system. This capacity stores ladder logic programs, registers, and configuration settings. The module uses CMOS RAM technology for fast read and write access. A lithium battery preserves all data when the PLC powers down. Consequently, you never lose programs or critical process values during shutdowns.
Four memory chips provide the 32 kB storage array. One address decoder IC manages memory mapping within the PLC address space. Six 100 µF capacitors filter electrical noise from the power supply. These capacitors also provide 15 seconds of hold-up time during battery changes. Therefore, you can replace the battery without losing stored data.
Write Protection and Data Security
A hardware jumper prevents accidental program overwrites or deletions. Install the jumper to enable write protection for critical data. Remove the jumper to allow normal program saving and editing. The amber battery low LED warns you when battery voltage drops below 2.7 V. Replace the battery within two weeks to prevent data loss.
Installation and Physical Details
The module weighs only 0.32 kg for simple handling. Insert the edge connector firmly into the dedicated memory slot. Secure the board with two retaining screws. No external wiring or configuration switches are necessary. Operating temperature ranges from 0°C to 60°C reliably. Store the module between -20°C and 70°C for long-term preservation. Keep humidity below 90% without condensation to prevent corrosion.
Details
| Weight | 0.2 kg |
|---|---|
| Dimensions | 85 × 65 × 30 mm |
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