Product Name:Analog Input Modules
Brand Name: SIEMENS
Model Number:505-6108A
Country of Origin:GERMANY
Warranty: 12 Months
Whatsapp：+86 18159889985
Email：[email protected]
Brand Name: |
SIEMENS |
Model Number: |
505-6108A |
Country of Origin: |
GERMANY |
Packaging Details: |
Original new Factory Sealed |
Delivery Time: |
Delivery time in stock |
Payment Terms: |
T/T |
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Sales Manager: |
Stella |
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The Siemens 505-6108A is an 8-channel analog input module engineered for the SIMATIC 505 (TI 505) platform. This single-wide 505‑6108A captures signals from industrial sensors using an asynchronous fixed update for voltage (±5 V/±10 V) or current (0–20 mA). The 505‑6108A requires no external 24 V power supply. With 12‑bit resolution and isolated inputs, the 505‑6108A maintains accurate operation in noisy PLC environments. Now discontinued, the 505‑6108A can be replaced by the CTI 2558 for legacy system support.
Process Control Systems: Monitoring pressure, temperature, flow, liquid level, pH.
Manufacturing Automation: Collecting real‑time analog data on assembly lines, welding robots, and automated machinery.
**Water & Wastewater Treatment Continuous monitoring of process variables such as level, flow rate, turbidity, and chemical composition.
Energy & Utilities: Power quality monitoring, energy metering, and load analysis in power plants and substations.
HVAC & Building Automation: Sensing temperature, humidity, and differential pressure in large building control systems.
8 Single‑ended Input Channels with per‑channel configuration for voltage or current.
12‑bit A/D Conversion providing accurate translation of analog field signals into digital PLC values.
Optional ±10 V Input range via on‑board jumper selection, increasing signal compatibility.
Asynchronous Operation decouples the I/O scan from the module conversion, improving system flexibility.
Built‑in Module Good front-panel LED (green) indicates proper operation, no external tools needed【B-1†L4】.
Overrange Indication The digital word transmitted to the controller contains a dedicated overrange bit.
Sampling Rate Flexibility The module automatically updates all eight channels within 250 ms maximum.
Selectable Voltage Input Ranges: ±5 V, ±10 V, 0‑5 V, 0‑10 V, plus 0‑20 mA current.
Optical Isolation: 1500 Vrms isolation between field I/O and the PLC backplane.
No External Power Required : Works directly with existing Series 505 backplane power.
Converts analog field signals (voltage or current) into a 12‑bit digital word (placed in a 16‑bit word) for processing by the CPU.
Operates asynchronously so the I/O scan reads previously stored data from the module’s internal buffer rather than waiting during the conversion. This ensures stable input values regardless of scan timing.
Performs dual‑slope integration (A version) to reject AC line noise (50/60 Hz) for stable readings in electrically noisy industrial environments.
Isolates field inputs from the controller via optical barriers, protecting the CPU from voltage spikes and ground loops.
Provides an integrated status indicator – the Module Good LED stays on as long as backplane power is present and the module passes its internal self‑test.
Generates overrange detection setting the overrange bit in the transmitted digital word when the input signal exceeds the selected range.
Q1: What is the difference between the 505‑6108A and the 505‑6108B analog input module?
A1: Both 505‑6108A and 505‑6108B are 8‑channel analog input modules. The 505‑6108B offers higher conversion resolution (13 bits plus sign vs. 12 bits plus sign), faster update time (25 ms max vs. 250 ms max), and uses successive approximation for better speed. The 505‑6108A is typically used for slower, low‑frequency industrial transducers, while the 505‑6108B is better suited for applications requiring higher resolution and faster update rates, such as motion control. Both are form‑fit compatible.
Q2: What is the recommended direct replacement for the Siemens 505‑6108A?
A2: The CTI 2558 analog input module is a drop‑in replacement for the 505‑6108A (and 505‑6108B) that requires no rewiring and is compatible with all Siemens 545/555 PLCs. It offers improved isolation (140 Vrms channel‑to‑channel) and supports 16‑bit/13‑bit resolution with a faster 5 ms update time per channel.
Q3: How is the 12‑bit resolution practically applied for industrial measurements?
A3: The 12‑bit value is placed inside a 16‑bit digital word delivered to the PLC. For a 0–5 V input, a change of 1 LSB corresponds to 1.25 mV (5 V / 4000 counts); for 0–20 mA, 1 LSB = 5 µA (20 mA / 4000 counts). The formula is: Digital Word = (Input / Full Scale) × 32,000. The upper four bits in the 16‑bit word contain the sign, overrange flag, and two unused bits.
Q4: How do I install and calibrate the 505‑6108A module?
A4: Install the 505‑6108A in any vacant I/O slot in a Series 505 base (power off first). Use a shielded twisted‑pair cable, terminate the shield at the source end, and follow the wiring diagram in Section 2.3 of the user manual. After installation, configure the module as an 8‑point word in TISOFT. To calibrate, disable power, mount a calibration extender, apply a precision voltage/current (e.g. ±5 V or ±10 V), then adjust the potentiometer on the board until digital values show –32,000 (negative full scale) and +32,000 (positive full scale). Siemens recommends recalibration every 6‑12 months for industrial use.
Q5: Does the 505‑6108A require external 24 V power? What about a 4‑20 mA loop?
A5: No. The 505‑6108A does not require an external user‑supplied 24 V power supply. It draws power directly from the Series 505 backplane (max. 4 W). For 4‑20 mA applications, a 250 Ω precision resistor (0.1%) is built into the module, so no external resistor or external power is needed. The voltage drop across the resistor is internally measured by the module. This design simplifies field wiring, especially for 2‑wire and 4‑wire transmitters in hazardous areas.
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