Siemens
Siemens catalog pages in Nexsyflow are structured for engineering-led model lookup, lifecycle review, and RFQ routing. Use this brand hub to move from brand intent to series and product decisions without switching tools.
Series List
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ET 200SP BU15 BaseUnits
ET 200SP BU15 BaseUnits is the baseline branch for cabinet ET200 projects where terminal arrangement, potential-group layout, and spare strategy still need to be stabilized before the exact base unit is chosen. Within Launch Refresh 2026-03-14, the practical separation comes from terminal layout, potential-group planning, and broad ET 200SP compatibility. Use this branch when the project already points to ET 200SP but still needs a stable cabinet-base family before the exact order code is fixed. For retrofit and spare work, keep the installed footprint and documentation path in view so the baseline ET 200SP choice remains supportable over time. Compare it against shielded and high-feature variants when EMC handling, denser terminations, or more segmented layouts might change the shortlist.
2 productsET 200SP BU20 BaseUnits
ET 200SP BU20 BaseUnits is the Siemens ET 200SP base-unit branch that usually makes sense when the installation still belongs in the ET 200SP platform but the wiring concept points to screw-terminal base units rather than push-in handling. Compared with BU15, BU20 is the more natural family when the project, the maintenance routine, or the installed-base expectation still favors screw terminations. Compared with BU30, it is usually the cleaner choice when the cabinet does not need the denser or more feature-heavy base-unit branch and the priority is a stable ET 200SP cabinet wiring baseline. Keep this family in scope when the ET 200SP decision is already made and the next question is which screw-terminal base-unit layout matches the module, potential-group, and wiring plan. Read the product list as a base-unit fit map first, then narrow by exact terminal arrangement, shield handling, and the required module pairing.
2 productsET 200SP BU30 BaseUnits
ET 200SP BU30 BaseUnits is the denser Siemens ET 200SP base-unit branch for projects that still belong in ET 200SP but need a more feature-rich or tighter cabinet-side base-unit layout than the BU15 or BU20 families. Compared with BU15 and BU20, BU30 is usually the stronger family when the installation benefits from a denser terminal concept, more segmented base-unit handling, or a higher-feature ET 200SP layout. It is usually unnecessary when the project only needs the simpler standard cabinet branch and there is no clear density or layout pressure. Keep this family in scope when the ET 200SP platform is fixed and the remaining decision is how compact or segmented the base-unit layout should be. Read the product list as a higher-density ET 200SP map first, then narrow by exact base-unit code, terminal arrangement, and module pairing.
2 productsS7-1200 SM1221 Digital Inputs
S7-1200 SM1221 Digital Inputs is the Siemens S7-1200 signal-module branch for adding 24 VDC digital input capacity when the PLC platform is already fixed and the remaining choice is how many field input points the station needs. Compared with SM1222 digital outputs, SM1221 is the input-side family for reading switches, sensors, and status signals rather than driving loads. Compared with SM1231 analog inputs, it is the simpler branch when the field devices are discrete on/off points and the project does not need analog measurement channels or scaling behavior. Keep this family in scope when the controller is already S7-1200 and the next question is how much discrete input expansion belongs in the rack. Read the product list by input count and electrical fit first, then narrow by wiring density, terminal layout, and the exact field-device mix.
2 productsS7-1200 SM1222 Digital Outputs
S7-1200 SM1222 Digital Outputs is the Siemens S7-1200 signal-module branch for adding discrete output channels when the PLC already belongs in the S7-1200 platform and the next decision is how many field loads the station needs to switch. Compared with SM1221 digital inputs, SM1222 is the output-side family for driving relays, solenoids, indicators, or other discrete loads rather than reading incoming field signals. Compared with SM1231 analog inputs, it is the right branch when the task is on/off actuation instead of analog sensing or process-value acquisition. Keep this family in scope when the rack still needs more discrete output capacity and the controller platform is already settled. Read the product list by output count and output type first, then narrow by electrical interface, load behavior, and the exact cabinet or machine wiring plan.
2 productsS7-1200 SM1231 Analog Inputs
S7-1200 SM1231 Analog Inputs is the Siemens S7-1200 signal-module branch for adding analog measurement channels when the controller platform is already S7-1200 and the project needs process values instead of only discrete field points. Compared with SM1221 and SM1222, SM1231 is the branch for analog sensing, scaling, and measured-value acquisition rather than simple on/off inputs or switched outputs. It is usually the right family when the station has to read transmitters, analog sensors, or process signals that do not belong in the digital I/O path. Keep this family in scope when the PLC already sits in the S7-1200 range and the remaining decision is how many analog channels and which signal types the panel needs to support. Read the product list by channel count and analog signal support first, then narrow by resolution, wiring fit, and the intended process-variable mix.
2 productsSIMATIC HMI Basic Panels
SIMATIC HMI Basic Panels is Siemens' entry-level operator-panel family for straightforward HMI tasks where the project needs a simple panel interface without moving into the richer Comfort or Unified branches. Compared with Comfort Panels, Basic Panels is usually the simpler choice for routine operator interaction, smaller machines, or cost-sensitive visualization needs. Compared with Unified Panels, it is the cleaner branch when the project does not need the newer Unified runtime path or a more feature-heavy HMI platform. Keep this family in scope when the HMI decision still sits at the entry level and the remaining question is which screen size or panel format fits the machine. Read the product list by display size and basic interface fit first, then narrow by mounting, communication, and the intended operator task.
2 productsSIMATIC HMI Comfort Panels
SIMATIC HMI Comfort Panels is Siemens' mid-range HMI panel family for machines that need a richer operator interface than the Basic branch without moving all the way into the Unified platform path. Compared with Basic Panels, Comfort Panels is usually the stronger family when screen capability, feature depth, or broader machine-HMI expectations matter more than keeping the panel branch simple. Compared with Unified Panels, it is the natural choice when the project still fits the established Comfort path and does not need the newer Unified runtime direction. Keep this family in scope when the machine already points beyond entry-level HMI but the panel strategy does not yet require Unified. Read the product list by display size and interface fit first, then narrow by communication needs, mounting format, and the intended operator workload.
2 products