Description
MS 377 — Memory
Siemens · MS 377 · 6ES5377-0AB31
Description
The MS 377 (6ES5377-0AB31) is a RAM memory submodule for the SIMATIC S5-135U/155U system, with 64 KByte capacity, used as working/user memory expansion for the CPU.
Key specifications
Parameter | Value |
Function | RAM memory submodule for S5-135U/155U |
Memory type | RAM |
Capacity | 64 KByte (per inventory desc; related 377 RAM modules documented at 32/64k) |
Mounting | Plug-in submodule on S5-135U/155U CPU |
Reference
Field | Value |
Manufacturer (OEM) | Siemens |
Model | MS 377 |
Part number | 6ES5377-0AB31 |
Category | Memory |
System family | SIMATIC S5-135U/155U |
Stores quantity | 4 |
Data confidence | medium |
Manuals filed (007 - Manuals)
- Manual CP1430 English Vol1.pdf — S5-115U system reference (CP/comms volume)
- 02 - CPU948 Programming Manual.pdf — S5 CPU programming reference (115U/155H family)
Notes
377-series RAM memory modules for S5-135U/155U confirmed via 6es7.pl and besturingen.com (e.g. 6ES5377-0AA21 32KB RAM, 6ES5377-0BA31 64KB RAM); exact -0AB31 order suffix not independently located. Verify capacity/type on nameplate.
Source: Spare Parts List for Sales V7 (Bohemia Market / BM Global stores inventory). Filed in the AI HW Knowledge Base.