6ES5928-3UA21 belongs to classic Siemens SIMATIC S5 PLC family, single-width rack module for S5-135U/155U backplane. It is programmed by STEP5 software. It supports memory submodule (RAM / EPROM) for user program storage, with built-in TTY 20mA current loop interface for PG programming and operator panel connection.

It can manage up to 2048 digital I/O points and 256 analog channels, includes 256 timers and 256 counters for sequential and time-critical control tasks. LED indicators and onboard switches are equipped for status display, fault diagnosis and module setting. Protection class IP20, operating temperature range 0~60℃.

6ES5928-3UA21 is obsolete Siemens S5 CPU spare part. Many old automation equipment still run S5-135U/155U control systems. When the original CPU fails, replacement with identical 6ES5928-3UA21 can reuse rack, backplane wiring and existing STEP5 user program. Technicians install the module, download program and test I/O communication, so the whole PLC control system resumes operation and reduces downtime.

Before shipment, every 6ES5928-3UA21 undergoes comprehensive functional inspection including power-on self-test, memory test, TTY interface verification and backplane bus communication check. All products come with 12-month warranty. Our automation technical team provides remote support for installation, wiring guidance, program download and fault diagnosis. Fast global shipping available for urgent maintenance orders.

For automation maintenance engineers and system integrators, 6ES5928-3UA21 is reliable spare CPU module for legacy Siemens SIMATIC S5 control systems. It restores program execution and I/O management functions, extends service life of automation assets and avoids whole control system renovation.