Siemens 6ES5415-7AB21 Digital Output Module

This module switches high-current loads like contactors and solenoids reliably. The Siemens 6ES5415-7AB21 provides 8 transistor outputs for 24 V DC applications. It measures 232 mm in width and 75 mm in height. This unit weighs approximately 0.58 kg for standard rack mounting.

Technical Specifications Table

Parameter	Value
Product Model	Siemens 6ES5415-7AB21
Category	Digital Output Module
Number of Outputs	8 channels
Output Type	Transistor, source (PNP)
Output Voltage	24 V DC
Output Current	2 A per channel
Total Current	8 A maximum per module
Dimensions (W x H x D)	232 mm x 75 mm x 130 mm
Weight	0.58 kg
Connector Type	1 x 20-pin female screw terminal
Internal Components	8 x power transistors, 1 x optocoupler array
Electrical Isolation	500 V AC between outputs and backplane
Energy Storage	None (outputs turn off immediately on power loss)
Short Circuit Protection	Electronic, with automatic restart
Inductive Load Suppression	Integrated freewheeling diodes

Internal Design and Load Protection

This output module uses eight high-power transistors for switching heavy loads. An optocoupler array provides complete isolation between CPU and field devices. The Siemens 6ES5415-7AB21 includes integrated freewheeling diodes for inductive loads. Electronic short circuit protection activates automatically during overload conditions. The module stores no energy for output retention after power-off. Consequently, all outputs reset to OFF when the system loses power. Each channel can drive two standard contactors simultaneously without external relays.

Installation and Wiring Guide

First, mount this module into any S5 rack slot except the CPU slot. Next, connect your 24 V DC supply to pins 1 and 20 on the front connector. Then, wire your load devices to the 8 output pins (2 through 9). Each output channel handles up to 2 A of continuous current. Use a 4 A slow-blow fuse for external short circuit protection at the module level. The module displays output status via 8 green LEDs on the front panel. This unit works with all SIMATIC S5 CPU models including 115U, 135U, and 155U.