Introduction
Maintenance engineers know that unplanned downtime often starts at the I/O layer. The STBACI1230K from Schneider Electric is a standard analog input kit built for the Modicon STB distributed I/O solution. It combines a 2-channel current input module, a mounting base, and two terminal connector options in one serviceable package. This kit suits plants that need reliable 0…20 mA signal acquisition without complex configuration.
What Is the STBACI1230K?
The kit contains the STBACI1230 analog input module, an STBXBA1000 base, and both an STBXTS1100 screw-type connector and an STBXTS2100 spring clamp connector. You get two analog input channels with 0…20 mA current type and 12-bit resolution. A single low-pass input filter at 25 Hz smooths noisy field signals. The module communicates through the logic bus and requires four input words for addressing. With a 5 ms response time and 10 ms update time, it handles typical process monitoring tasks.
Key Specifications That Matter on the Floor
Three parameters drive daily reliability. First, the 12-bit resolution and +/-0.5 % full-scale accuracy at 25 °C give you dependable measurement for pressure, flow, or level loops. Second, input impedance of 300 Ohm or less limits burden on your transmitters. Third, the 100 mA per channel sensor supply current lets you power two-wire transmitters directly, reducing external wiring. The module also provides short-circuit protection and 1500 V insulation between channels and the logic bus for one minute. Temperature drift stays low at +/-0.01 %/°C, so accuracy holds across a -25…70 °C operating range.
Serviceability and Hot Swapping
For maintenance teams, the STBACI1230K reduces mean time to repair. Cold swapping is supported, and hot swapping fallback works with standard NIMs. On basic NIMs the fallback state is state 0; on user-configurable standard NIMs you define the behavior. This means you can replace a module without shutting down the entire segment in many cases. Two front LEDs simplify diagnostics: a green module status LED (RDY) and a red module error LED (ERR). A quick glance tells you whether the fault is in the module or elsewhere in the loop.
Where It Fits: Applications
This kit targets distributed I/O architectures in process and factory automation. In a water treatment plant, the two 0…20 mA channels can monitor differential pressure across filters. In a packaging line, they can read load-cell or position signals from analog sensors. In an OEM skid, the compact 128.3 mm width and 70 mm depth save panel space. Because the kit ships with both screw and spring clamp connectors, you can match the existing wiring style on site without ordering extra parts.
Installation and Setup Notes
Mount the STBXBA1000 base on a 35 x 7.5 mm or 35 x 15 mm symmetrical DIN rail. The kit meets vibration resistance of +/-0.35 mm from 10…58 Hz and 3 gn from 58…150 Hz on the smaller rail, plus 5 gn on the larger rail. Shock resistance is 30 gn for 11 ms. Wire the 0…20 mA loop to the terminal connector, observing polarity. The module draws 30 mA at 5 V DC from the logic bus and requires a 24 V DC supply through a power distribution module such as the STBPDT3100 or STBPDT3105. Keep the installation within pollution degree 2 and 2000 m altitude limits. The IP20 rating means the cabinet must protect the module from dust and moisture.
Compatibility and Integration
The STBACI1230K works within the Modicon STB distributed I/O family. It supports data formats per EN 61131-2 and IEC 61131-2, which simplifies integration with common PLC environments. The kit is compatible with the STBXBA1000 mounting base and STBPDT3100/3105 power distribution modules. Certifications include ATEX Cat 3G, CSA, C-Tick, FM Class 1 Division 2, and UL, so it fits hazardous-area and industrial panels where those approvals are required. Overvoltage category II and CE marking round out the compliance profile.
Maintenance and Reliability
From a reliability standpoint, the STBACI1230K offers predictable wear points. The main service items are the terminal connectors and the module itself. Inspect connectors periodically for tightness and corrosion, especially in humid environments up to 95 % relative humidity at 60 °C without condensation. Check the RDY and ERR LEDs during routine rounds. If the ERR LED lights, verify the sensor supply current and loop wiring before replacing the module. Because the kit supports cold swapping and hot swapping fallback, you can stock one spare and swap it quickly. That approach lowers spare-parts inventory and shortens repair windows.
Selection and Sourcing
Before ordering, confirm your NIM type, since hot swapping fallback behavior depends on whether it is a basic or user-configurable standard NIM. Verify that your application needs two 0…20 mA channels and 12-bit resolution. Check that you have a 24 V DC supply and a compatible power distribution module. The kit includes both connector types, so you do not need to buy them separately. For current availability and replacement options, contact SpareTechPLC. Please verify current lifecycle status and availability with SpareTechPLC before ordering.
Frequently Asked Questions
What is included in the STBACI1230K kit?
It includes the STBACI1230 analog input module, an STBXBA1000 base, an STBXTS1100 screw-type connector, and an STBXTS2100 spring clamp connector.
How many analog channels does this kit provide?
It provides two analog input channels with 0…20 mA current type and 12-bit resolution.
Can I replace the module while the system is running?
Yes, cold swapping is supported. Hot swapping fallback works with standard NIMs; on basic NIMs the fallback state is state 0, and on user-configurable standard NIMs you can define it.
What power supply does the module need?
It uses 24 V DC through a compatible power distribution module such as STBPDT3100 or STBPDT3105, and draws 30 mA at 5 V DC from the logic bus.
What certifications does the STBACI1230K carry?
It carries ATEX Cat 3G, CSA, C-Tick, FM Class 1 Division 2, and UL certifications, with CE marking and overvoltage category II.
