Siemens G26004-A3118-P115 Module

This module provides discrete input capability for Siemens industrial automation systems. It interfaces directly with field sensors such as limit switches and push buttons. Therefore, it captures real-time status signals for programmable logic controller processing.

Physical and Power Specifications

The Siemens G26004-A3118-P115 measures 12.0 cm in length and 8.5 cm in width. Moreover, its module weight equals approximately 0.22 kg for DIN rail mounting. A single 12-pin removable terminal block handles all field wiring connections. Additionally, this module receives 24 VDC power from the system backplane.

Parameter	Specification
Brand	Siemens
Full Model	G26004-A3118-P115
Category	Module (Discrete Input)
Dimensions (L x W x H)	12.0 cm x 8.5 cm x 6.5 cm (4.72″ x 3.35″ x 2.56″)
Module Weight	0.22 kg (0.49 lbs)
Primary Interface	1 x 12-pin Removable Screw Terminal Block
Operating Voltage	24 VDC from Backplane (19.2 to 30 VDC)
Power Consumption	1.5 W (Typical)
Input Channels	8 Independent Channels
Input Type	Sink (NPN)
Input Voltage Range	0 to 30 VDC
Input On-State Voltage	> 15 VDC
Input Off-State Voltage	< 5 VDC
Input On-State Current	8 mA Typical at 24 VDC
Input Impedance	3.0 kΩ
Input Response Time (On)	3 ms (Typical)
Input Response Time (Off)	3 ms (Typical)
Input Isolation	Optocoupler (1500 Vrms)
Common Configuration	8 Inputs Share One Common (Isolated Group)
On-Board Components	8 Optocouplers + 8 Current Limiting Resistors + 2 Protection Diodes + 1 EMI Filter + 1 LED Driver IC
Energy Storage	2 x 47 µF Electrolytic Capacitors (35V) + 1 x 10 µF Tantalum (25V)
Operating Temperature	0°C to +55°C (32°F to 131°F)
Storage Temperature	-25°C to +85°C (-13°F to 185°F)
Mounting Type	DIN Rail (EN 50022)
Status Indicators	8 Green LEDs (One per Channel) + 1 Green LED (Power)

Input Channel Features and Signal Processing

The Siemens G26004-A3118-P115 accepts eight independent discrete input signals at 24 VDC. For instance, each input includes an optocoupler for complete electrical isolation from the logic side. In addition, the input impedance of 3.0 kΩ suits standard industrial proximity sensors. Moreover, all eight channels respond within 3 milliseconds to signal changes. Consequently, this module captures fast field events without missing critical transitions.

Energy Storage and Operational Stability

This module stores energy using three onboard capacitors for power filtering. Specifically, two electrolytic capacitors smooth the 24 VDC supply for stable optocoupler operation. In addition, one tantalum capacitor provides high-frequency noise suppression for the input circuits. Furthermore, these capacitors maintain stable operation during brief power interruptions. Therefore, the Siemens G26004-A3118-P115 continues functioning through minor supply dips reliably.

Installation and Diagnostic Indicators

You will find nine LED indicators on the module’s front panel for diagnostics. First, eight green LEDs light when each corresponding input receives an active 24 VDC signal. Second, a green Power LED indicates the presence of backplane operating voltage. Additionally, the removable terminal block accepts 18-22 AWG stranded or solid wires. Thus, you can diagnose system status instantly without external tools or meters.