Name: Schneider 140DAI75300 Discrete Input Module | SAUL ELECTRICAL
Brand: Schneider
SKU: 140DAI75300
Price: 2970.00 USD
Availability: InStock

Description

Product Introduction & Engineering Value

The 140DAI75300 is designed for Quantum control systems that need to monitor a large number of high-voltage AC discrete signals. It provides 32 inputs at 230 VAC, organized into four groups, with individual LED indication for input status. Published specifications also identify a 250 mA bus-current requirement and maximum power dissipation of 5 W.

The important replacement issue is voltage class. This is a 230 VAC input module, not a general-purpose digital input card. A visually similar 24 VDC or 115 VAC Quantum module is not an acceptable substitute. Schneider’s recommended replacement, BMXDAI0805, has only eight 200–240 VAC inputs, so replacing the legacy module may require changes to channel allocation and cabinet architecture.

Technical Specifications

Parameter	Specification
Catalog Number	140DAI75300
Platform	Modicon Quantum
Module Type	VAC Discrete Input
Number of Inputs	32
Nominal Input Voltage	230 VAC
Channel Groups	4 groups
Addressing Requirement	2 input words
Frequency Range	47–63 Hz
Input Current	≤9.7 mA at 47–53 Hz; ≤11.5 mA at 57–63 Hz
State 1 Voltage	175–264 VAC at 47–53 Hz; 165–264 VAC at 57–63 Hz
State 0 Voltage	0–40 VAC
Input Impedance	31.8 kΩ at 47–53 Hz; 26.5 kΩ at 57–63 Hz
Leakage Current	≤2.6 mA
Absolute Maximum Input	264 VAC continuous; 312 VAC for 10 s; 400 VAC for 1 cycle
Isolation	1780 Vrms for 1 minute
Bus Current	250 mA
Power Dissipation	≤5 W
Operating Temperature	0–60°C

The published electrical data shows why this module should be matched carefully during procurement. The guaranteed ON-state voltage depends on line frequency, while the module has a defined leakage current and a relatively high 230 VAC input rating.

Field Application & the “Trench” Experience

A common failure scenario involves a Quantum rack monitoring dozens of 230 VAC auxiliary signals: motor contactor feedback, breaker status, heater contactors, pump permissives, and other hardwired indications. One channel suddenly remains OFF even though the field device is energized.

The technician measures the field voltage first. The signal is present. The wiring is intact. The problem then points toward the corresponding input channel on the 140DAI75300.

With 32 channels, channel identification matters. The technician records the affected input, checks the module’s individual LED, verifies the AC level against the module’s input thresholds, and compares the PLC status with the physical signal before replacing the card.

Specific application scenarios include:

Motor control centers: 230 VAC contactor and breaker status feedback.
Boiler auxiliary systems: high-voltage permissive and equipment-status signals.
Pump station control panels: AC-powered run/fault and interlock indications.
Industrial heating equipment: contactor and heater-stage status monitoring.

140DAI75300

Transparency SOP: QA & Testing

For New Surplus or refurbished 140DAI75300 inventory, testing should be performed with appropriate electrical safety controls.

Part-number verification — Confirm 140DAI75300 on the actual module label.
Visual inspection — Check the housing, terminal connections, backplane connector, labels, and mounting features.
Input-channel inspection — Verify all 32 input indicators and associated circuitry where the test fixture permits.
Controlled AC test — Apply appropriate test voltages within the published operating range using an isolated, protected test setup.
State verification — Confirm that representative inputs transition correctly between OFF and ON states.
PLC interface test — Verify that the Quantum backplane correctly reports the input states to the controller.
Isolation check — Where suitable equipment is available, verify the applicable isolation characteristics.
Final condition report — Identify the unit clearly as New Surplus, Used, or Refurbished and document the test status.

Do not bench-test a 230 VAC input module with improvised wiring. The electrical test itself presents a significant shock and arc hazard.

The Veteran’s Tech Trap Guide

⚠️ Trap #1 — 230 VAC is the critical specification.

Do not substitute a 24 VDC or 115 VAC Quantum input card because the physical module appears similar. The 140DAI75300 is specifically designed around 230 VAC discrete inputs.

⚠️ Trap #2 — Watch the leakage current.

The published leakage current is ≤2.6 mA. This matters when the field device or circuit has a high-impedance input and the technician is troubleshooting an unexpected voltage that appears even when the PLC input should be OFF.

PRO TIP: When diagnosing an apparently false ON state, measure the circuit under the actual connected load. An unloaded multimeter reading can be misleading on AC circuits.

⚠️ Trap #3 — Don’t assume the replacement has the same channel density.

Schneider recommends BMXDAI0805 as the replacement for 140DAI75300, but BMXDAI0805 provides 8 inputs, compared with the 140DAI75300’s 32. Four replacement modules may therefore be required to reproduce the original channel count, depending on the migration architecture.

⚠️ Trap #4 — Check the frequency-dependent input thresholds.

The guaranteed ON-state range differs between the 47–53 Hz and 57–63 Hz bands. If the field supply is outside the expected frequency range or voltage is marginal, do not assume a failed input module until the actual AC supply has been measured.

Dynamic FAQ

Q: What is the Schneider 140DAI75300?
A: It is a Modicon Quantum 32-channel discrete input module for 230 VAC signals.

Q: How many inputs does the 140DAI75300 have?
A: It provides 32 discrete AC inputs, arranged in four groups and requiring two input words for addressing.

Q: What voltage does the 140DAI75300 accept?
A: Its nominal input voltage is 230 VAC. The guaranteed ON-state range is 175–264 VAC at 47–53 Hz and 165–264 VAC at 57–63 Hz.

Q: Is the 140DAI75300 discontinued?
A: Yes. Schneider Electric’s U.S. product page lists it as discontinued on January 15, 2023, with end-of-service scheduled for December 31, 2030. Lifecycle dates can differ by regional Schneider site.

Q: What is the recommended replacement for 140DAI75300?
A: Schneider recommends the BMXDAI0805, an X80 8-input module rated for 200–240 VAC. Because it has eight inputs rather than 32, the replacement should be engineered around the existing channel count and rack architecture rather than treated as a direct one-for-one replacement.

Q: How should New Surplus 140DAI75300 stock be verified?
A: Confirm the exact catalog number on the physical module, inspect the 32-channel indicator panel and connectors, and ask whether the unit was electrically tested. Because this is a 230 VAC module, ask specifically what controlled test procedure was used. The supplier should also state the New Surplus condition, warranty period, and return terms in writing.