Siemens 6ES5521-8MB12 Serial Interface

Series#: Siemens

Product Details

6ES5521-8MB12 – SIEMENS SIMATIC S5 CP 521 BASIC Serial Interface Module for reliable point-to-point communication.
Enables RS-232C/RS-422 serial data exchange with printers, terminals, and host computers in S5-115U/135U/155U systems.
Integrated BASIC interpreter for custom communication programs, reducing PLC CPU load.
Supports 20 mA current loop (TTY) and V.24/RS-232C standards with selectable baud rates up to 19.2 kbps.
Robust industrial design with LED diagnostics for transmit/receive status and error indication.
Drop-in replacement for legacy S5 systems, ensuring seamless migration or maintenance.
100% Brand New & Original, securely packed and ready for reliable global shipping.

Specification

The 6ES5521-8MB12 is a dedicated SIEMENS SIMATIC S5 CP 521 BASIC Serial Interface module designed to extend the communication capabilities of S5-115U, S5-135U, and S5-155U programmable logic controllers. This module features an on-board BASIC interpreter that allows users to implement custom serial protocols without consuming PLC CPU resources, making it ideal for connecting to barcode scanners, weigh scales, printers, or SCADA systems over RS-232C, RS-422, or 20 mA current loop interfaces. With support for full-duplex and half-duplex modes, adjustable baud rates, and hardware handshaking, the 6ES5521-8MB12 ensures robust and flexible data exchange in demanding industrial environments. Its compact design fits directly into the S5 rack, and the front-panel LEDs provide instant visual feedback on communication status, power, and faults, simplifying troubleshooting. Each unit is factory-tested and guaranteed 100% original and new, backed by fast global shipping.

Parameter	Specification
Product Type	SIEMENS SIMATIC S5 CP 521 BASIC Serial Interface Module
Model Number	6ES5521-8MB12
Supported PLC Platforms	S5-115U, S5-135U, S5-155U
Interface Standards	RS-232C (V.24), RS-422, 20 mA current loop (TTY)
Data Transmission Rate	300, 600, 1200, 2400, 4800, 9600, 19200 baud (selectable)
Data Format	7 or 8 data bits; odd, even, or no parity; 1 or 2 stop bits
Operating Modes	Full-duplex, half-duplex
Handshaking	Hardware (RTS/CTS) and software (XON/XOFF)
Memory	16 KB BASIC program memory (battery-backed RAM)
Programming Language	On-board BASIC interpreter
Diagnostic Indicators	Power (PWR), Transmit (TXD), Receive (RXD), Error (ERR)
Connector Type	25-pin D-sub (female) for serial interface
Power Supply	5 V DC from S5 backplane (typ. 600 mA)
Ambient Temperature	0 °C to +55 °C (operating); -25 °C to +70 °C (storage)
Dimensions (W x H x D)	Approx. 40 mm x 230 mm x 160 mm (single-width module)
Weight	Approx. 0.3 kg
Certifications	CE, UL, CSA (as per S5 system)
Shipping Condition	100% Original and New, ready for immediate dispatch