Product Description
Product Overview
The Allen-Bradley 1785-MS is an 8K RAM Memory Module designed as an optional memory expansion for PLC-5 programmable logic controllers (PLCs), enhancing their capacity for user programs and data tables. Manufactured by Allen-Bradley, a brand under Rockwell Automation known for its industrial automation solutions, this module provides 8K words of CMOS SRAM (Static Random-Access Memory) to supplement the built-in memory of PLC-5 processors such as the 1785-L20 or 1785-L11B. Unlike EEPROM modules (e.g., 1785-ME16), the 1785-MS relies on a lithium battery backup (e.g., 1770-XZ) to retain its volatile memory contents during power loss. It is installed in the memory module slot of compatible PLC-5 processors, offering a cost-effective way to increase memory for ladder logic programs and I/O data in legacy systems used in industries like manufacturing and process control. As part of the discontinued PLC-5 series, it remains relevant for maintaining existing installations.
Technical Information
| Item | Specifications |
|---|---|
| Manufacturer | Allen-Bradley (Rockwell Automation) |
| Series | PLC-5 |
| Model/Part Number | 1785-MS |
| Description | 8K SRAM Memory Module |
| Memory Type | CMOS SRAM (volatile) |
| Memory Capacity | 8K words |
| Memory Backup | Lithium battery (1770-XZ, 3V, 1800 mAh) |
| Compatibility | PLC-5 processors (e.g., 1785-L11B, 1785-L20) |
| Operating Temperature | 0 °C to +60 °C (32 °F to +140 °F) |
| Dimensions | 51 mm H x 25 mm W x 76 mm D (2.0 in x 1.0 in x 3.0 in) |
| Weight | 0.05 kg (0.11 lb) |