Order number 6ES7321-1BL00-0AA0 is a genuine Siemens part from the SIMATIC S7-300 range. Official description: SIMATIC S7-300, digital input SM 321, isolated 32 DI, 24 V DC, 1x 40-pole.
Many plants keep their S7-300 lines running while planning a migration to S7-1500; an exact like-for-like spare avoids changing the hardware configuration in STEP 7 / TIA Portal.
See our Siemens range.
Siemens lists this order number as a spare part, which means it is still supplied for existing installations while newer versions exist for new projects. We supply the exact order number for like-for-like replacement and can quote the current version too.
Technical data
| Siemens order number | 6ES7321-1BL00-0AA0 |
|---|---|
| Digital inputs | 32 |
| Input delay | لا يوجد |
| Power loss, typ. | 6.5 W |
| Permissible supply range | 20.4 V … 28.8 V |
| Dimensions (W x H x D) | 40 x 125 x 120 mm |
| Weight, approx. | 0.26 kg |
| Condition | New, original Siemens |
Key features (per Siemens)
- SIMATIC S7-300
- Digital input SM 321
- Isolated 32 DI
- 24 فولت DC
- 1x 40-pole
Typical applications
- Machine and process-line controllers
- Replacing a failed CPU, I/O or power supply module
- Keeping an installed S7-300 system running before migration
- Spare-part stock for maintenance teams
Compatibility and replacement
Use exactly the same order number when possible, because the hardware configuration in STEP 7 or TIA Portal refers to it. Check the firmware version of a CPU on the label of the old unit; if a newer version is supplied, it can normally replace the older one, but confirm with your hardware configuration.
Replacement checklist
- Compare the full order number 6ES7321-1BL00-0AA0 with the label on the old unit, including the last digits (they identify the version).
- Look for signs of overvoltage, water or heat damage in the cabinet so the new part does not fail for the same reason.
- Note the firmware version printed on the old unit; TIA Portal or LOGO! Soft Comfort must support it.
Frequently asked questions
Which software is used?
STEP 7 (SIMATIC Manager) or TIA Portal, depending on the version used for the existing project.
Does it need a front connector?
Signal modules use a separate 20-pin or 40-pin front connector (6ES7392-…), which is ordered separately unless it is the item itself.
Can I get a datasheet?
The official manufacturer datasheet is the source of the technical data above; we can send the PDF with the quotation on request.
Do you supply larger quantities for projects?
Yes. For panel builders and plant projects we quote complete lists; send the bill of materials on WhatsApp or through the inquiry form.
How fast can you deliver, and is there a warranty?
Air shipping usually takes 5 to 7 days once the part is ready, to almost any country. Each part is new and original with a 1-year warranty. Message us on WhatsApp with the order number for a quotation.
Ordering tips
Send us the full order number from the label of the old part, or a clear photo of the label, together with the quantity you need. We check the number against the current manufacturer data before we quote and tell you if there is a newer replacement.
RendatSP ships from Yiwu, China, to factories worldwide; air delivery usually takes 5 to 7 days once the part is ready. The part is new and original with a 1-year warranty (shipping, payment and warranty). For a quotation, message us on WhatsApp with the order number and quantity. We also have agents in Saudi Arabia, Iraq, the UAE, Egypt, Oman, Libya, Morocco, Mauritania, Yemen, Algeria and Jordan.
