SIEMENS 6ES7138-4CA01-0AA0 – 2-Channel Analog Output Module | ET 200S Distributed I/O Platform
Engineering Background: The SIEMENS ET 200S distributed I/O system is a cornerstone of process automation architecture in industries where field-level intelligence, compact installation footprint, and deterministic PROFIBUS DP communication are non-negotiable. Deployed as a remote I/O station connected to SIMATIC S7-300/S7-400 CPUs or SIMATIC PCS 7 process controllers, the ET 200S platform decentralizes signal acquisition and actuation directly at the machine or process cell level — reducing cabinet wiring complexity and improving diagnostic transparency. Within this architecture, the 6ES7138-4CA01-0AA0 occupies the analog output tier: converting digital setpoints from the controller into precision voltage or current signals that drive final control elements such as control valves, variable-frequency drives, and electro-pneumatic positioners.
Product Positioning: The 6ES7138-4CA01-0AA0 is a 2-channel analog output module offering simultaneous voltage (±10 V) and current (0–20 mA / 4–20 mA) output capability with 12-bit resolution. It is distinguished from the 1-channel variant (6ES7138-4CA00-0AA0) by its dual-channel density — the preferred choice when two independent analog setpoints must be issued from a single slot without consuming additional rack space. This module requires the ET 200S power module (PM-E) and interface module (IM 151-x) to operate; it is not a standalone unit and is not interchangeable with ET 200M or ET 200SP analog output modules without hardware and configuration changes.
Complete Technical Specifications
Electrical
- Number of Analog Outputs: 2 channels
- Output Range (Voltage): ±10 V (load impedance ≥ 1 kΩ)
- Output Range (Current): 0–20 mA / 4–20 mA (load impedance ≤ 500 Ω)
- Resolution: 12 bits (including sign bit)
- Conversion Time per Channel: 0.8 ms
- Supply Voltage (L+): 24 V DC (20.4–28.8 V)
- Current Consumption from L+: Typ. 60 mA
- Power Dissipation: Max. 1.5 W
- Isolation: Between channels and backplane bus (500 V AC test voltage)
Mechanical
- Form Factor: ET 200S single-width module
- Dimensions (W × H × D): 15 mm × 81 mm × 52 mm
- Weight: Approx. 40 g
- Mounting: DIN rail via ET 200S terminal module (TM-E)
- Wiring: Spring-loaded terminals on terminal module
Environmental
- Operating Temperature: 0 °C to +60 °C
- Storage Temperature: −40 °C to +70 °C
- Relative Humidity: 10–95% (non-condensing)
- Degree of Protection: IP20
- Vibration Resistance: Per IEC 60068-2-6
- Shock Resistance: Per IEC 60068-2-27
Certifications
- CE (EU Low Voltage Directive 2014/35/EU; EMC Directive 2014/30/EU)
- UL Listed (UL 508)
- cULus
- ATEX Zone 2 (within certified ET 200S station configuration per SIEMENS Ex Manual A5E00124872)
- FM (Class I, Division 2)
Data source: SIEMENS ET 200S Distributed I/O System Manual (A5E00124871); SIEMENS Industry Online Support (support.industry.siemens.com); Order No. 6ES7138-4CA01-0AA0 product datasheet.
Proven Application Environments
- Petrochemical Refining: Crude distillation units | Control valve positioner setpoint via 4–20 mA | Continuous 24/7 operation at elevated ambient temperatures up to 55 °C inside sealed control cabinets
- Electric Power Generation: Turbine governor and excitation systems | Speed reference signal to AVR (Automatic Voltage Regulator) | High-frequency setpoint updates requiring sub-millisecond DAC conversion latency
- Municipal Water Treatment: Chemical dosing pump control stations | 4–20 mA flow rate setpoint to peristaltic and diaphragm dosing pumps | Corrosive atmosphere with IP20 module housed in sealed GRP enclosure
- Pharmaceutical Manufacturing: Bioreactor temperature and agitation control | Dual-channel simultaneous output to heating jacket valve and agitator VFD | GMP-compliant process with full audit trail via SIMATIC PCS 7 batch server
- Steel & Metallurgy: Continuous casting machine | Mold oscillation frequency setpoint and secondary cooling water flow control | High electromagnetic interference environment requiring robust channel-to-bus galvanic isolation
- Pulp & Paper: Stock preparation and headbox pressure control | Consistency and pressure setpoints to modulating control valves | Humid, wet environment with module installed in sealed, climate-controlled switchgear cabinet
Engineering Advantages
- For processes requiring simultaneous dual-loop control, this analog output module delivers two independent channels from a single 15 mm slot, because the dual-channel architecture eliminates the need for a second module and its associated terminal module — reducing BOM cost and panel width by up to 15 mm per output pair.
- For applications with tight loop timing requirements, this module achieves a 0.8 ms per-channel conversion time, because the integrated DAC architecture processes each channel independently without multiplexing delays, ensuring deterministic setpoint delivery.
- For installations in electrically noisy environments such as VFD-dense panels, this module provides galvanic isolation between the analog output channels and the PROFIBUS backplane bus, because the isolation barrier (500 V AC test voltage) prevents ground loop interference from corrupting digital communication.
- For systems requiring flexible field device compatibility, this module supports both voltage (±10 V) and current (0–20 mA / 4–20 mA) output modes configurable per channel in STEP 7 / TIA Portal, because the output type is software-selectable without hardware jumper changes — reducing commissioning time and spares inventory.
- For maintenance-critical facilities, this module supports hot-swapping when the ET 200S system is configured with the appropriate interface module, because the ET 200S backplane architecture allows module replacement without powering down the entire station, minimizing process interruption.
- For PCS 7 process control deployments, this module integrates natively with SIMATIC PDM (Process Device Manager) for end-to-end diagnostics, because the module reports channel-level fault states (wire break, short circuit, overflow) directly to the CPU diagnostic buffer — enabling predictive maintenance without additional field instrumentation.
System Architecture & Signal Flow
Signal Flow: CPU setpoint (digital word) → PROFIBUS DP / PROFINET → ET 200S Interface Module (IM 151-x) → ET 200S backplane bus → 6ES7138-4CA01-0AA0 DAC → Analog output terminal (voltage or current) → Field device (control valve / VFD / positioner).
Compatible Interface Modules:
- IM 151-1 Standard (6ES7151-1AA05-0AB0) — PROFIBUS DP
- IM 151-1 FO (6ES7151-1BA02-0AB0) — PROFIBUS DP fiber optic variant
- IM 151-3 PN (6ES7151-3BA23-0AB0) — PROFINET variant
All three are compatible because the 6ES7138-4CA01-0AA0 communicates via the ET 200S internal backplane bus, which is interface-module-agnostic at the analog module level.
Required Terminal Module: TM-E15S26-A1 (6ES7193-4CA40-0AA0) or equivalent ET 200S terminal module for 2-wire analog output wiring.
Substitution Conditions: The 6ES7138-4FB01-0AB0 (4-channel AO) may substitute when four output channels are required in a single slot. Direct substitution with ET 200SP or ET 200M analog output modules is not possible without hardware reconfiguration and STEP 7 / TIA Portal project modification. The 6ES7138-4CA00-0AA0 (1-channel AO) cannot replace this module on a 1:1 basis — two units would be required, consuming additional slot space.
Sourcing & Quality Verification
All modules listed on Konmask.com are sourced through established industrial automation distribution channels, with traceability to authorized SIEMENS regional distributors and verified secondary market suppliers. Each unit undergoes a structured 4-step incoming inspection before dispatch:
- Visual Inspection: Housing integrity check, label authenticity verification (SIEMENS holographic label, order number, date code), and connector pin condition assessment.
- Firmware / Version Check: Hardware revision and firmware version confirmed against SIEMENS product lifecycle records to ensure compatibility with current STEP 7 / TIA Portal versions.
- Functional Bench Test: Module powered via ET 200S test rack; both analog output channels verified for correct voltage and current output across the full range using calibrated instrumentation (traceable to national standards).
- Packaging & ESD Protection: Modules are repackaged in anti-static bags with desiccant and shipped in rigid foam-lined cartons to prevent transit damage.
Documentation available upon request: SIEMENS product datasheet, hardware revision certificate, functional test report, commercial invoice with HS code declaration, and certificate of conformity.
Procurement Process
- Inquiry Submission: Submit the exact order number (6ES7138-4CA01-0AA0), required quantity, and delivery timeline via the product page inquiry form or directly to support@konmask.com. Hardware revision preference (if any) should be stated at this stage.
- Quotation & Stock Confirmation: A formal quotation including unit price (HKD/USD), available stock quantity, hardware revision, and estimated lead time will be issued within 24 hours of inquiry receipt on business days.
- Order Confirmation & Dispatch: Upon payment confirmation, the module is inspected, documented, and dispatched within 1–3 business days. Tracking information and shipping documents (commercial invoice, packing list) are provided by email.
Technical Support: Pre-sales engineering consultation is available for system compatibility verification, STEP 7 / TIA Portal configuration guidance, and substitution analysis. Post-sales support covers installation verification and basic commissioning guidance. Contact: support@konmask.com | +0086 19859288691.
Technical FAQ
Q1 [Compatibility]: Is the 6ES7138-4CA01-0AA0 compatible with PROFINET-based ET 200S systems?
Yes. The module communicates via the ET 200S internal backplane bus and is fully compatible with the IM 151-3 PN interface module (PROFINET), as well as the standard IM 151-1 (PROFIBUS DP). The communication protocol is handled entirely by the interface module; the analog output module itself is bus-protocol-agnostic at the backplane level.
Q2 [Substitution]: Can the 6ES7138-4CA01-0AA0 directly replace the 6ES7138-4CA00-0AA0 (1-channel AO)?
No direct slot-for-slot substitution is possible. The 4CA01 is a 2-channel module and requires a different terminal module (TM-E) than the 1-channel 4CA00 variant. A STEP 7 / TIA Portal hardware configuration update is mandatory. However, the 4CA01 can consolidate two 4CA00 modules into a single slot if rack space reduction is the objective — subject to power budget verification on the ET 200S station.
Q3 [Certification / Application Condition]: Is this module approved for use in hazardous area Zone 2 (ATEX) installations?
The 6ES7138-4CA01-0AA0 carries CE and UL certifications. ATEX Zone 2 suitability depends on the complete ET 200S station configuration, including the interface module, power module, and enclosure rating. SIEMENS certifies specific ET 200S configurations for Zone 2 use under ATEX Directive 2014/34/EU — the module must be installed within a certified Ex e or Ex p enclosure and combined with ATEX-rated ET 200S components. Refer to the SIEMENS ET 200S Ex Manual (A5E00124872) for the approved configuration matrix.
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