Siemens S7-400 CP440-1 RS-422/485 processor / 6ES7440-1CS00-0YE0

6ES7440-1CS00-0YE0: One point-to-point channel for ASCII or 3964(R), not an Ethernet interface. Specifications follow the exact manufacturer table in the May 2017 catalogue; verify supplied revision, current lifecycle and availability separately.

Manufacturer part number: 6ES7440-1CS00-0YE0
Brand: Siemens
Category: PLC and HMI
Catalog status: Request a quotation

Technical specifications

Controller family: SIMATIC S7-400
Communication interface: 1 x RS-422/RS-485 (X.27)
Protocols: ASCII; 3964(R)
Communication speed: 115.2 kbit/s maximum with ASCII or 3964(R)
Maximum nodes: 32, per manufacturer overview
Cable length: 1200 m maximum, shielded RS-422/485 cable; installation and baud-rate conditions require exact manual
Engineering: STEP 7 with module parameter-assignment forms
CPU memory requirement: 1–5 Kbytes per interface for parameters, in S7-CPU memory card
Current from backplane bus: 360 mA maximum from 5 VDC backplane
Power loss: 1.7 W typical
Width: 25 mm
Height: 290 mm
Depth: 210 mm
Weight: Approximately 600 g
Document pages: PDF 96
Current lifecycle status: Not established by historical May 2017 catalogue; confirm current lifecycle and supply separately

Manufacturer technical catalog · Siemens ST400 May 2017; exact technical and ordering tables, PDF 96 · en · PDF · ST400 May 2017Manufacturer source: Siemens · Model explicitly covered in family document · Covered models: 6ES7440-1CS00-0YE0 · Checked: 2026-10-22Official manufacturer source

This sheet provides a quick technical summary. For design, installation and final selection, review the latest official manufacturer documentation and verify the complete part number.