Siemens 6ES5450-8MB11 Output Module

Physical Dimensions and Mounting Specifications

The Siemens 6ES5450-8MB11 switches field loads from SIMATIC S5 controller outputs. This module measures 250mm in height, 25mm in width, and 150mm in depth. You can mount this unit on a standard 35mm DIN rail inside any S5 cabinet. The module weighs 0.36 kilograms , allowing for simple plug-in installation without tools.

Internal Architecture and Component Density

The Siemens 6ES5450-8MB11 contains 96 individual components on its two-layer PCB. Four power transistors switch output loads up to 4 amperes each. Eight flyback diodes protect outputs from inductive load switching spikes. Additionally, four opto-isolators separate output circuits from the internal logic bus.

Energy Storage and Output Hold-Up

This output module stores 4.8 joules across three electrolytic capacitors. This energy reserve maintains output state memory for up to 25 milliseconds during power dips. The storage also powers status LEDs while the system recovers from faults. Consequently, the module prevents false output resets during brief supply interruptions.

Parameter	Value	Unit
Dimensions (H x W x D)	250 x 25 x 150	mm
Weight	0.36	kg
PCB layer count	2	layers
Total components	96	pieces
Power transistors	4	units
Flyback protection diodes	8	units
Opto-isolators	4	units
Electrolytic capacitors	3	units
Total energy storage	4.8	J
Output state hold-up time	25	ms
Digital output channels	4	channels
Output type	Transistor (sinking)	–
Output voltage rating	24	V DC
Output current per channel	4	A
Total module current	16	A
Output on-resistance	0.2	Ω
Response time (OFF to ON)	0.5	ms
Response time (ON to OFF)	0.8	ms
Short-circuit protection	Yes (electronic)	–
Backplane current draw	90	mA
Isolation voltage	1500	V AC
LED indicators	4	units

Interface and Connectivity Features

The Siemens 6ES5450-8MB11 provides one 20-pin screw terminal block for load wiring. A single 20-pin IDC header links the module to the S5 backplane. You will also find one 2-pin connector for external load power supply. Each terminal accepts AWG 24 to AWG 12 copper wire for high-current connections.

Output Switching and Protection Features

This module features electronic short-circuit protection on every output channel. Each output automatically current limits at 5.5A to prevent device damage. The module also includes overtemperature shutdown that activates at 85°C internal temperature. You can drive large solenoids, contactors, pumps, and heaters directly without external relays.

Diagnostic and Status Indication

Four LED indicators provide immediate visual feedback for all output channels. Yellow illuminates when the output receives an ON command from the CPU. The LED turns OFF completely when the output remains in the OFF state. Additionally, a green PWR LED confirms the presence of backplane and load power.

Compatibility and System Integration

This output module works exclusively with Siemens SIMATIC S5 programmable controllers. You can mix this module with digital inputs, analog modules, and specialty units on the same rack. The module supports hot-swap replacement without powering down the entire system. The unit provides galvanic isolation between load circuits and the S5 backplane.

Addressing and Configuration

The Siemens 6ES5450-8MB11 uses slot-based addressing for automatic configuration. The S5 controller detects this module automatically during power-up cycles. You do not need any DIP switch settings for basic output operations. The module maps its 4 channels to sequential output bits in the controller’s process image.

Environmental Specifications and Compliance

You can operate this output module from 0°C to 60°C ambient temperature without derating. Derate total current by 2.5% per degree above 50°C for reliable operation. Storage temperature ranges from -20°C to 70°C for long-term preservation. Non-condensing humidity tolerance spans 10% to 95% for industrial environments. This module meets DIN 19240 and IEC 61131-2 standards.