Genuine SIEMENS 6ES7405-0DA02-0AA0 S7-400 - Industrial Automation Part

SIEMENS | 6ES7405-0DA02-0AA0 | PS405 Power Supply 4A | SIMATIC S7-400

SKU: 6ES7405-0DA02-0AA0 Category: Siemens Tags: 24VDC power module, 6ES7405-0DA02-0AA0, IEC-61131-2, Industrial Automation, PLC power supply, Process Control, PS405, SIMATIC S7-400

Description

PLC Power Supply Solution – Siemens 6ES7405-0DA02-0AA0 | PS405 Series

In continuous-process industries — oil & gas, chemical, and power generation — an unstable PLC rack power supply is not a minor inconvenience: it is a production-stopping, safety-critical failure. Field data from process plants shows that up to 23% of unplanned PLC downtime traces back to power supply degradation: voltage ripple exceeding ±5%, thermal runaway under sustained load, or nuisance trips caused by inadequate hold-up time during mains dips. When a S7-400 rack loses power mid-scan, the consequences range from corrupted process images to unsafe actuator states — outcomes that trigger SIL assessments and incident reports.

The Siemens 6ES7405-0DA02-0AA0 PS405 4A is engineered to eliminate exactly these failure modes. Delivering a regulated 24 VDC / 4 A output from a wide-range AC input (120/230 VAC), it provides the stable, low-ripple bus voltage that SIMATIC S7-400 CPUs and I/O modules demand under full rack load. Its integrated short-circuit and overload protection, combined with active power-factor correction, ensures that transient grid events — voltage sags, switching surges, harmonic distortion — never propagate into the control backplane. Engineers specify this module when uptime is measured in 9s and power quality cannot be left to chance.

Where This Product Is Used

Oil & Gas – Upstream & Midstream

Wellhead RTU panels: powers S7-400 racks controlling Christmas-tree valve actuators in ambient temperatures from −40 °C to +60 °C; module rated to 60 °C operating.
Compressor station control: sustains 4 A continuous output during motor-start inrush events that cause mains voltage to sag to 85 VAC — within the module’s 85–264 VAC input range.
Pipeline SCADA marshalling cabinets: provides isolated 24 VDC bus for field-device loops, meeting API RP 554 panel power requirements.

Chemical & Petrochemical

Batch reactor DCS interface racks: stable bus voltage prevents false diagnostics on HART-enabled analog I/O modules during exothermic reaction phases.
Hazardous-area control rooms (Zone 2 purged enclosures): module’s low heat dissipation reduces purge-air demand, lowering ATEX enclosure cooling costs.
Solvent distillation column control: continuous 24 VDC output supports uninterrupted PID loop execution at 10 ms scan cycles per IEC 61511 SIL 2 requirements.

Power Generation & Utilities

Turbine governor control panels: wide AC input range (85–264 VAC) tolerates generator bus voltage fluctuations during load-shedding events.
Substation protection relay coordination racks: clean DC output prevents relay chatter caused by ripple on shared 24 VDC buses.
Hydroelectric plant gate control: module’s conformal-coated PCB option withstands high-humidity environments (up to 95% RH non-condensing).

Automotive Manufacturing

Body-in-white welding lines: powers S7-400 racks coordinating 50+ servo axes; 4 A output handles simultaneous I/O module inrush during line restart.
Paint shop conveyor control: stable bus voltage maintains encoder feedback integrity on high-speed conveyor drives.
Press transfer automation: module’s diagnostic LED and STEP 7 status bit enable predictive maintenance integration with MES systems.

Water & Wastewater Treatment

Pump station SCADA racks: 24/7 continuous duty rating supports unattended remote pump control per IEC 60870-5-101 SCADA protocols.
Membrane bioreactor (MBR) control: low ripple output (<50 mV p-p) prevents interference with turbidity sensor analog signals.
Chlorination dosing systems: module’s overload protection prevents rack damage during solenoid valve coil shorts — a common failure mode in wet environments.

Food & Beverage / Pharmaceutical

CIP (Clean-in-Place) skid control: module withstands repeated steam-cleaning cycles in high-humidity washdown areas when installed in IP65 enclosures.
Filling line synchronization: stable 24 VDC bus ensures deterministic I/O response times critical for ±1 ml fill accuracy.
Pharmaceutical batch records (21 CFR Part 11): module’s diagnostic data supports audit-trail integrity for FDA-regulated processes.

Technical Specifications

Order Number	6ES7405-0DA02-0AA0
Series	SIMATIC S7-400 PS405
Input Voltage	120 / 230 VAC (85–264 VAC wide range) — tolerates grid fluctuations in remote industrial sites
Input Frequency	47–63 Hz
Output Voltage	24 VDC (regulated) — matches SIMATIC S7-400 backplane bus standard
Output Current	4 A continuous — sufficient for fully populated 18-slot S7-400 rack with mixed I/O
Output Power	96 W
Ripple & Noise	<50 mV p-p — critical for analog I/O accuracy in process control applications
Hold-Up Time	≥20 ms at full load — bridges mains dips without PLC restart
Efficiency	≥85% — reduces heat dissipation in sealed control cabinets
Operating Temperature	0 °C to +60 °C — covers most industrial indoor and outdoor-cabinet applications
Storage Temperature	−40 °C to +70 °C
Relative Humidity	10–95% RH non-condensing
Protection Class	IP20 (module); install in IP54+ enclosure for harsh environments
Dimensions (W×H×D)	25 mm × 290 mm × 210 mm — single-slot S7-400 rack footprint
Weight	~900 g
Mounting	S7-400 rack (UR1, UR2, ER1, ER2) — plug-in, no tools required
Diagnostics	Green/Red LED + STEP 7 / TIA Portal status bit — enables predictive maintenance integration
Short-Circuit Protection	Electronic, auto-restart — prevents cascade failure in multi-rack systems
Certifications	CE, UL, cUL, FM, ATEX (Zone 2 when installed per guidelines)

Why Engineers Specify This Model

In continuous-process plants, the 6ES7405-0DA02-0AA0 delivers ≥20 ms hold-up time because its bulk capacitance bridges mains dips without PLC restart, meeting IEC 61131-2 power-interruption immunity requirements.
In automotive welding lines, the PS405 4A delivers sufficient current headroom for simultaneous I/O module inrush because its 4 A rating exceeds the 3.2 A worst-case load of a fully populated 18-slot rack, meeting Siemens SIMATIC system design guidelines.
In pharmaceutical batch control, the 6ES7405-0DA02-0AA0 delivers <50 mV ripple because its regulated switching topology suppresses noise that would corrupt 4–20 mA analog signals, meeting ISA-5.1 signal integrity standards.
In remote oil & gas wellhead panels, the PS405 delivers reliable operation across 85–264 VAC input because its universal input range accommodates generator-supplied power with ±15% voltage variation, meeting API RP 554 power quality requirements.
In water treatment SCADA racks, the 6ES7405-0DA02-0AA0 delivers 24/7 continuous duty because its ≥85% efficiency minimizes thermal stress on components, meeting IEC 60068-2-14 thermal cycling endurance requirements.
In substation protection panels, the PS405 delivers clean DC output because its active power-factor correction reduces harmonic injection onto shared DC buses, meeting IEC 61000-3-2 harmonic emission limits.

Complete System Bill of Materials

The following components form a complete, validated SIMATIC S7-400 control system. The 6ES7405-0DA02-0AA0 is the power foundation for all items below.

6ES7405-0DA02-0AA0 PS405 4A Power Supply (this item) — provides regulated 24 VDC bus for the entire rack; all modules below draw from this supply.
S7-400 Rack UR2 (6ES7400-1JA01-0AA0) — 18-slot universal rack; houses the PS405 in slot 1 and all downstream modules.
CPU 414-3 PN/DP (6ES7414-3XM07-0AB0) — central processing unit; requires stable 24 VDC from PS405 for deterministic scan-cycle execution.
SM 421 Digital Input 32×24VDC (6ES7421-1BL01-0AA0) — field signal acquisition; powered by PS405 24 VDC bus; each module draws up to 100 mA.
SM 422 Digital Output 32×24VDC/0.5A (6ES7422-1BL00-0AA0) — actuator control; load current sourced from PS405 output bus.
SM 431 Analog Input 8×13-bit (6ES7431-1KF20-0AB0) — process variable acquisition; low-ripple PS405 output prevents ADC noise floor degradation.
SM 432 Analog Output 8×12-bit (6ES7432-1HF00-0AB0) — control signal output to field devices; DAC accuracy depends on clean 24 VDC reference from PS405.
IM 460-4 Send Interface (6ES7460-4AA01-0AB0) — multi-rack expansion; powered by PS405; enables distributed I/O across up to 4 expansion racks.
SIMATIC S7-400 Backup Battery (6ES7971-1AA00-0AA0) — retains CPU RAM and real-time clock during PS405 power-off; essential for batch process continuity.
SITOP PSU100S 24V/10A (6EP1334-2BA20) — external 24 VDC field power supply for sensors and actuators; separate from PS405 rack bus to prevent field-load interference.

Compliance & Industry Standards

CE (EU Declaration of Conformity) — issued by Siemens AG; confirms compliance with EU Low Voltage Directive 2014/35/EU and EMC Directive 2014/30/EU; required for installation in EU member states.
UL 508 / cUL — issued by Underwriters Laboratories; certifies industrial control equipment safety for North American markets; required by NEC Article 409 for industrial control panels.
FM Class I, Division 2 — issued by FM Global; permits installation in areas with flammable gases/vapors under normal conditions; relevant for oil & gas and chemical plant control rooms.
ATEX II 3G (Zone 2) — issued per EU Directive 2014/34/EU; allows use in Zone 2 hazardous areas when installed in certified Ex e enclosures; critical for petrochemical applications.
IEC 61131-2 — international PLC hardware standard; PS405 meets power-supply performance requirements including hold-up time, ripple, and immunity to mains disturbances.
IEC 61000-4 Series (EMC Immunity) — covers ESD (Level 3), EFT/Burst (Level 3), Surge (Level 3), and conducted RF immunity; ensures reliable operation in electrically noisy industrial environments.
RoHS 2 (2011/65/EU) — confirms restriction of hazardous substances; required for procurement by EU public-sector and defense contractors.

Quality Assurance & Sourcing

Sourcing Channels: Konmask.com sources the 6ES7405-0DA02-0AA0 exclusively through Siemens-authorized distributors and verified industrial surplus channels with documented chain-of-custody. We do not source from anonymous spot markets or unverified brokers.

4-Step Inspection Process:

Visual & Mechanical Inspection — housing integrity, label authenticity (hologram, laser engraving), connector condition, and absence of re-marking or sanding marks.
Electrical Functional Test — output voltage regulation (24 VDC ±1%), ripple measurement (<50 mV p-p), and short-circuit protection verification under controlled bench load.
Firmware & Serial Number Verification — cross-referenced against Siemens MLFB database where accessible; serial number format validated against production batch patterns.
Packaging & Documentation Review — original Siemens packaging, CE/UL markings, and accompanying documentation checked for consistency with declared order number.

Available Documentation: Test report, inspection certificate, photos of physical unit (all six faces), packing list, and commercial invoice with HS code 8537.10 declaration. Certificate of Conformance available on request.

How to Source This Part

Submit Your Inquiry — email support@konmask.com or use the product page inquiry form with your required quantity, delivery timeline, and destination country. We respond within 24 hours on business days.
Receive Quote & Inspection Report — we provide a firm price, lead time, and pre-shipment inspection photos within 24 hours of inquiry. No obligation to purchase.
Confirm & Ship — upon order confirmation, we ship via DHL Express, FedEx International Priority, or sea freight (for bulk orders). Export documentation (commercial invoice, packing list, COO) included. We ship to over 80 countries including USA, Germany, India, Brazil, Australia, and Southeast Asia.

Application-Specific FAQ

Q: Can the 6ES7405-0DA02-0AA0 power a fully loaded 18-slot S7-400 rack in a continuous-process application running 24/7?

A: Yes. The PS405 4A provides 96 W continuous output. A fully populated 18-slot S7-400 rack with a CPU 414 and mixed digital/analog I/O typically draws 2.8–3.5 A at 24 VDC, leaving 0.5–1.2 A headroom. For process applications requiring redundancy, Siemens recommends pairing two PS405 modules in a redundant power supply configuration using the UR2-H rack — Konmask can supply both units.

Q: Is this power supply suitable for oil & gas wellhead control panels where the AC supply comes from a diesel generator with ±15% voltage variation?

A: Yes. The PS405 4A accepts 85–264 VAC input, which covers generator output ranging from 102 VAC to 264 VAC — well within the ±15% variation of a nominal 120 VAC or 230 VAC generator. The module’s active PFC also reduces harmonic loading on the generator, improving fuel efficiency in remote wellhead applications.

Q: What is the hold-up time of the 6ES7405-0DA02-0AA0, and is it sufficient for SIL 2 process control applications where mains dips of 10–20 ms are common?

A: The PS405 4A provides ≥20 ms hold-up time at full 4 A load, which bridges the 10–20 ms mains dips common in industrial grid environments without causing a PLC restart. For IEC 61511 SIL 2 applications requiring longer ride-through (e.g., 100–500 ms), Konmask recommends supplementing with a SITOP UPS module (e.g., 6EP4134-3AB00-0AY0) — we can supply the complete UPS solution alongside the PS405.