Description

The Siemens 6ES7223-1BF22-0XA0, also known as the EM 223, is a digital mixed I/O expansion module designed exclusively for the SIMATIC S7-200 PLC series. This compact module provides 4 digital inputs and 4 transistor outputs at 24V DC, serving as an efficient solution for expanding the I/O capacity of S7-22X CPUs in space-constrained applications .

As a vital building block for legacy S7-200 systems, the Siemens 6ES7223-1BF22-0XA0 offers galvanic isolation through optocouplers, protecting the backplane bus from field-side electrical noise while delivering reliable signal conditioning for sensors and actuators . With the S7-200 series now discontinued, this module represents a critical spare part for maintaining existing installations .

 

Application Scenarios

A food processing facility relied on an S7-200-based packaging line with limited I/O capacity. When the control system required additional sensors to monitor product presence and conveyor status, the engineering team integrated the Siemens 6ES7223-1BF22-0XA0 into the existing expansion rack. The module’s 4 digital inputs were connected to proximity sensors, while the 4 transistor outputs drove small solenoid valves for product diverters—all without upgrading the CPU or rewiring the main control panel. The compact 46mm width fit neatly into the crowded cabinet, and the pluggable terminal blocks minimized installation downtime .

In an automotive parts manufacturing line, the Siemens 6ES7223-1BF22-0XA0 was deployed to handle mixed signal requirements in a work cell. The 4 inputs monitored manual pushbuttons and interlock switches, while the 4 transistor outputs controlled indicator lamps and small contactors. The module’s optical isolation (500V AC) proved essential in the electrically noisy welding environment, preventing false triggers that had plagued previous installations .

 

Parameters

Main Parameters	Value/Description
Product Model	Siemens 6ES7223-1BF22-0XA0 (EM 223)
Manufacturer	Siemens
Product Category	Digital Mixed I/O Expansion Module
Digital Inputs	4, 24V DC, sink/source compatible (PNP/NPN)
Input Signal “1”	15 to 30V DC
Input Signal “0”	0 to 5V DC
Input Current (typ.)	4 mA @ 24V DC
Input Delay	≤ 4.5 ms
Digital Outputs	4, Transistor (MOSFET), 24V DC
Output Current per Channel	0.5 A (0.75 A rated in official spec)
Group Current (max.)	3 A
Backplane Bus Current	40 mA @ 5V DC
Power Loss (typ.)	2 W
Isolation	Optocoupler, 500V AC, groups of 4
Dimensions (W x H x D)	46 x 80 x 62 mm
Weight	Approx. 160 g
Protection Rating	IP20
Operating Temperature	0°C to +55°C (alternative -25°C to +60°C cited)
Cable Length (shielded)	500 m
Cable Length (unshielded)	150 m