Attributes

Brand	-
Category	3C Digital Accessories / MP3/MP4 Stands
Origin	-
Brand	Siemens
Series	SIMATIC S7-300
Model Number	CP 340-1
Communication Type	Serial Point-to-Point
Interface Standards	RS232C, RS422, RS485
Max Transmission Speed	19.2 kbit/s
Operating Voltage	24 V DC
Dimensions	40 x 125 x 115 mm
Weight	0.3 kg
Condition	Refurbished - Price Negotiable

6 reviews

Anonymous

Mar 27, 2026

Rating: 5/5

Reliable serial communication

Established a stable RS232 connection with our barcode scanners immediately. Configuration via STEP 7 was straightforward. Highly recommend for anyone maintaining S7-300 systems.

Anonymous

Mar 27, 2026

Rating: 3/5

Works but documentation was missing

The hardware functions correctly, but it did not come with the original manual or cable adapters. Had to download drivers separately. Still, for the price we agreed upon, it is acceptable.

Anonymous

Mar 24, 2026

Rating: 5/5

Perfect replacement for our legacy line

We needed a specific communication module for an older S7-300 setup and this CP 340 worked flawlessly out of the box. The seller was open to negotiation on the price which helped our budget significantly.

Anonymous

Mar 20, 2026

Rating: 5/5

Exactly what was described

Bought this to expand the I/O capabilities of an existing rack. The CP 340 module is genuine Siemens and performs perfectly. The 'Price Negotiable' tag is legitimate; we got a good discount.

Anonymous

Mar 05, 2026

Rating: 4/5

Good value, minor cosmetic wear

Functionality is 100% as expected for a Siemens part. There are some scuffs on the casing indicating it was used previously, but for the negotiated price, it is a great deal.

Anonymous

Mar 04, 2026

Rating: 4/5

Solid hardware, fair pricing

The unit works well. Shipping took a few days longer than expected, but the ability to negotiate the final cost made up for the wait. No issues with data transmission so far.

5 FAQ

Q: Does this come with a warranty?

A: Refurbished items typically come with a 90-day functional warranty. Please check the specific terms in the checkout section or contact us for extended warranty options.

Q: Does this module support RS485 two-wire connection?

A: Yes, the CP 340-1 supports RS232C, RS422, and RS485 (two-wire) interfaces depending on the specific sub-model and configuration selected in STEP 7.

Q: Can this be used with an S7-400 CPU?

A: No, the CP 340 is designed specifically for the SIMATIC S7-300 series rack system. For S7-400 systems, you would need the corresponding CP 440 module.

Q: What is the maximum baud rate supported?

A: This specific CP 340 model supports transmission speeds ranging from 300 bit/s up to 19.2 kbit/s.

Q: Is the price fixed or can I make an offer?

A: As indicated in the product title, the price is negotiable. Please use the 'Contact Seller' button to submit your offer based on quantity and condition requirements.

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