Introduction & Overview

The interface modules from ZEB Automation connect the world of industrial 24V control technology with modern IT interfaces. They allow for the simple connection of up to eight digital inputs and outputs to PC systems, terminals, or networks.

Thanks to the integrated logic, the modules can not only act as a pure I/O interface but also execute independent MFR time functions (Multifunction Relays) such as switch-on delays, clock generators, or wiping pulses.

Key Features

The following properties apply to the entire MFR series (XSP, XEP, XUP):

• 8 Digital Inputs: Designed for 24 VDC, galvanically isolated via optocouplers ($R_i=5k\mathrm{\Omega }$).
• 8 Digital Outputs: Depending on the model, either as semiconductor switches (L-series) or relays (R-series).
• Status LEDs: Direct visual control for every input and output as well as data traffic.
• Separate Power Supply: Separate feed for logic (8..30 VDC) and load/outputs to increase interference immunity.
• Industrial Grade: Mounting on DIN rail (TS35) and connection via pluggable spring-cage terminals (max. 0.5 mm²).

Available Variants

The modules primarily differ in their communication interface and the type of outputs.

By Interface

Series	Interface	Connection	Description
XSP	RS-232	DSUB-9 (Female)	Classic serial connection for terminals and industrial PCs.
XEP	Ethernet	RJ45	10/100BaseT network connection with integrated web server.
XUP	USB	USB-B	Direct connection to modern PCs (Virtual COM Port).

By Output Type

Type	Designation	Technology	Performance
L	Logic / Low-Side	Semiconductor (High-side)	24 VDC / 0.6 A per channel. Wear-free, ideal for fast switching sequences.
R	Relay	Mechanical Relay	Potential-free (Normally Open). Switching capacity up to 3 A. Ideal for galvanic isolation or higher loads.

By Form Factor

• Standard (Series 01): Compact housing, 90 x 77 x 40 mm.
• Narrow (Series 11): Space-saving housing, 120 x 22.5 x 100 mm (currently available for XSP series).