Siemens 6ES7135-6HD00-0BA1 Analog Output Module – SIMATIC ET 200SP

Siemens 6ES7135-6HD00-0BA1 — Four-Channel Analog Output Module for SIMATIC ET 200SP Distributed I/O

The 6ES7135-6HD00-0BA1 is a four-channel analog output module (AQ 4×U/I ST) belonging to Siemens’ SIMATIC ET 200SP distributed I/O family. It occupies a single BaseUnit slot within an ET 200SP station and delivers independently configurable voltage or current output signals to field devices — control valves, variable-speed drives, electropneumatic positioners, and proportional hydraulic valves — across a broad range of process and discrete manufacturing applications. Each channel operates autonomously: output type (±10 V voltage or 0/4–20 mA current), output range, and diagnostic behavior are parameterized per channel in TIA Portal, without hardware jumpers or DIP switches. This architecture eliminates the need to stock separate voltage-only and current-only module variants, reducing spare-parts inventory and simplifying commissioning documentation.

Within the ET 200SP station, the module communicates exclusively over the internal backplane bus. The interface module (IM 155-6 PN ST or IM 155-6 DP ST) handles all fieldbus transactions — PROFINET IRT/RT or PROFIBUS DP — while the AQ module exchanges process data and diagnostic frames with the IM at the backplane clock rate. This separation of fieldbus protocol from I/O function means the 6ES7135-6HD00-0BA1 is protocol-agnostic: the same module operates identically in a PROFINET station and a PROFIBUS station, with no firmware or hardware change required.

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Technical Parameters

Hardware Logical Analysis

The 6ES7135-6HD00-0BA1 implements a D/A conversion architecture based on a 13-bit-plus-sign sigma-delta DAC per channel pair, with output stage multiplexing to serve all four channels within the 500 µs conversion cycle. The voltage output path drives a low-impedance buffer amplifier capable of sourcing into loads ≥ 1 kΩ, while the current output path uses a precision voltage-to-current converter with a compliance voltage headroom of approximately 15 V at 24 V supply — sufficient to drive 600 Ω loads at 20 mA without output saturation.

Galvanic isolation between the channel group and the backplane bus is implemented via a DC/DC converter for the supply rail and optocouplers for the digital control signals. This isolation barrier withstands a test voltage of 500 V AC (1 min), protecting the backplane bus and the CPU from ground loops and transient overvoltages originating in the field wiring. The isolation does not extend between individual channels — all four channels share a common analog ground reference — which is a deliberate design trade-off to maintain the 15 mm module width. Engineers designing installations with multiple independent ground domains must account for this by using external signal isolators on individual channels where required.

EMC performance is achieved through a combination of hardware and mechanical design measures. The module housing is a conductive plastic composite that provides shielding continuity when seated on the BaseUnit. The BaseUnit’s PE contact establishes a low-impedance ground path to the DIN rail, and the module’s internal PCB layout routes analog signal traces away from the backplane bus data lines, with ground planes separating the two domains. The result is compliance with EN 61000-4-2 (ESD, ±4 kV contact / ±8 kV air), EN 61000-4-4 (EFT, 2 kV), and EN 61000-4-5 (surge, 1 kV line-to-line) without external filtering components on the field wiring terminals.

Diagnostic logic within the module monitors each output channel for wire-break conditions (current output only, detectable when loop current drops below approximately 1 mA in 4–20 mA mode) and short-circuit conditions (voltage output, detected when output current exceeds the driver’s current limit). Fault status is encoded in the module’s diagnostic data record and transmitted to the IM on the next backplane bus cycle, making fault information available to the CPU within one PROFINET/PROFIBUS cycle time — typically 1–4 ms in standard configurations. The module also supports substitute value behavior: on CPU STOP or communication loss, each channel can be parameterized to hold its last output value, output a defined substitute value, or drive to zero — a critical safety consideration for applications where actuator position at loss of control must be deterministic.

System Integration Benefits

• Per-channel output type selection without hardware changes: Voltage or current output is selected entirely in TIA Portal parameterization. Switching a channel from 4–20 mA to 0–10 V requires only a configuration download, not a module swap or jumper change — reducing commissioning time and eliminating wiring errors associated with hardware reconfiguration.
• Deterministic output update latency: The backplane bus cycle between the IM and I/O modules operates at a fixed clock rate independent of the PROFINET/PROFIBUS cycle. Output data written by the CPU is transferred to the AQ module’s output register within one backplane cycle (≤ 125 µs in standard ET 200SP configurations), ensuring that control loop output updates reach the field device with bounded, predictable latency.
• Substitute value parameterization for fail-safe behavior: Each channel’s behavior on CPU STOP, communication fault, or module fault is independently configurable. This allows engineers to define safe actuator positions (e.g., close a control valve by driving 4 mA, or hold last value for a drive) without relying on external fail-safe relays or additional hardware.
• Channel-level diagnostic transparency: Wire-break and short-circuit faults are reported at the individual channel level, not as a module-level fault. The CPU receives the exact channel number and fault type in the diagnostic interrupt, enabling the application program to execute channel-specific fault handling routines rather than taking the entire module offline.
• Hot-swap module replacement: The ET 200SP architecture supports module replacement under power when the station IM is configured for it. A failed 6ES7135-6HD00-0BA1 can be removed and replaced with a spare while the remaining modules in the station continue operating, limiting the impact of a module failure to the four affected output channels rather than the entire I/O station.
• Compact 15 mm slot width: The module’s 15 mm profile allows high-density I/O configurations within a standard 35 mm DIN rail cabinet section. A 300 mm wide ET 200SP station can accommodate up to 16 I/O modules, providing up to 64 analog output channels in a single station — a significant reduction in cabinet space compared to earlier S7-300 ET 200M configurations.
• ATEX Zone 2 / IECEx certification: The module is certified for use in Zone 2 explosive atmospheres (gas group IIC, temperature class T4) when installed in an appropriate enclosure. This extends the ET 200SP platform into oil and gas, chemical, and pharmaceutical applications where distributed I/O must be located in classified areas.
• Native TIA Portal engineering workflow: Hardware configuration, I/O address assignment, channel parameterization, online diagnostics, and firmware update are all performed within TIA Portal without external tools or proprietary configuration software. The module’s GSD/GSDML file is embedded in TIA Portal’s hardware catalog, and all diagnostic data is accessible via the standard online diagnostic view — reducing engineering overhead and training requirements.

Quality Assurance & Global Logistics

Every 6ES7135-6HD00-0BA1 unit supplied by siemensplc.com is sourced from verified Siemens-authorized distribution channels. Each module undergoes a structured incoming inspection protocol before entering our Xiamen warehouse stock: label and hologram authentication against Siemens’ current anti-counterfeiting specifications, housing and connector pin-alignment inspection under magnification, and firmware version verification where applicable. Units that do not pass inspection are quarantined and returned to the supply chain — they are not offered for sale.

Our Xiamen, China location provides direct access to major international freight hubs, including Xiamen Gaoqi International Airport and Xiamen Port. Standard export shipments are dispatched via DHL Express, FedEx International Priority, or UPS Express Saver, with transit times of 2–5 business days to most destinations in Southeast Asia, the Middle East, Europe, and North America. Each shipment is accompanied by a commercial invoice, packing list, certificate of origin, and certificate of conformity. Additional documentation — EUR.1 movement certificates, Form A GSP certificates, or CITES declarations — can be arranged upon request for specific destination requirements.

All modules are packed in ESD-safe anti-static bags, placed in foam-lined inner boxes, and sealed in double-wall corrugated outer cartons rated for international air freight handling. Moisture-barrier desiccant packs are included for shipments to high-humidity destinations. Shipment tracking numbers are provided within 24 hours of dispatch, and our logistics team monitors shipments proactively for customs holds or carrier delays.

A 12-month warranty against manufacturing defects is provided on all units. Warranty claims are processed within 5 business days of receipt of the returned unit, with replacement or credit issued upon confirmation of the defect. Our technical team is available to assist with installation verification and fault diagnosis to determine whether an issue is module-related or installation-related before initiating a warranty return.

Contact Information

Email: [email protected]
WhatsApp: +86 18359268345
Web: siemensplc.com
Location: Xiamen, China
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