Description
IM 308-C — Interface Module
Siemens · IM 308-C · 6ES5308-3UC21
Description
The IM 308-C is a PROFIBUS-DP master interface module for the S5-115U/135U/155U central controllers, providing a fieldbus master connection so the S5 CPU can communicate with distributed PROFIBUS-DP slave stations (e.g., ET 200 I/O). It occupies a central-rack slot and connects via a 9-pin PROFIBUS RS-485 port.
Key specifications
Parameter | Value |
Function | PROFIBUS-DP master interface module for S5-115U/135U/155U |
Bus type | PROFIBUS-DP, RS-485 |
Connector | 9-pin Sub-D PROFIBUS port |
Programmability | Memory cards programmable only in the IM308-C (5 V type) per Siemens documentation |
Mounting | Central rack slot, S5-115U/135U/155U |
Typical use | Master link to ET 200 / distributed I/O and other DP slaves |
Reference
Field | Value |
Manufacturer (OEM) | Siemens |
Model | IM 308-C |
Part number | 6ES5308-3UC21 |
Category | Interface |
System family | SIMATIC S5-115U/135U/155U |
GT stores quantity | 21 |
Data confidence | medium |
Manuals filed (007 - Manuals)
- S5_155H_CPU948R_M_Vol.1_E06_99.08_e.pdf — S5-115U/155H system manual documenting IM 308-C interface module
- Manual STEP5 S5-100U English.PDF — General S5 STEP5 reference; secondary cross-reference only
Notes
Part number and function confirmed via Siemens parts catalog listings; a dedicated IM308-C datasheet was not directly retrieved from Drive manuals, so exact electrical specs are per PROFIBUS-DP master family.
Source: Sohar 1 DCS field-component stores inventory (Total GT_BOP). Filed in the AI HW Knowledge Base.