ASM SIPLACE 03020588-05 is an X-axis read head used in the machine positioning system. Some aftermarket listings incorrectly pair 03020588 with P/N 00335990, but these are different components with different functions.
P/N 00335990 is documented separately as an RSF digital rotary encoder used inside the DLM2 placement head. It belongs to the head's rotary feedback system, while 03020588 belongs to the machine X-axis position-reading system. The two P/Ns should therefore remain separate in purchasing and maintenance records.
03020588 Read Head Identity
| Part Number | 03020588 |
| Documented Revision | 03020588-05 / S05 |
| Part Type | X-axis read head |
| System Area | Machine-axis position-reading path |
| Misleading Market Pairing | 00335990 is sometimes listed as an alternate P/N |
| 00335990 Actual Identity | DLM2 RSF digital rotary encoder |
| Functional Boundary | Machine linear-axis feedback versus placement-head rotary feedback |
The distinction is functional rather than merely numerical. Both components participate in position-feedback systems, which may explain why some aftermarket databases grouped them together, but they monitor different mechanisms at different assembly levels.
An X-axis problem should therefore remain inside the machine-axis diagnostic path: read head, measurement reference, mounting and related electrical connections. A DLM2 rotary encoder should not enter that repair decision simply because a supplier database presents the P/Ns together.
This also makes 03020588 useful as a procurement-data control point. If a quotation presents 03020588 / 00335990 as one interchangeable item, the relationship should be challenged before it is copied into an internal spare-parts database or maintenance BOM.
Another SIPLACE X-axis read-head family is 03094995. For 03020588, use the installed S05 label and machine-side location photos as the purchasing reference.