KSM 121-2 Kollmorgen
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The Kollmorgen KSM 121-2 is part of the KSM Safety Solution Modules series and supports 1 axis monitoring with a performance level of PL e and a safety integrity level of SIL 3. The module offers 12 safe digital inputs, supports multiple encoder types including SSI, SIN/COS, incremental TTL, and resolver, and has an ingress protection rating of IP52. Its dimensions are 100 x 115 x 45 mm, it operates at a supply voltage of 24 VDC, and weighs 390 grams.
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Product Description:
The KSM 121-2 safety module is produced by Kollmorgen as part of the KSM Safety Solution Modules series. Acting as a compact safety controller and feedback hub, the device supervises motion parameters on machines with hazardous moving parts. Integrated diagnostics and configurable I/O allow it to remove power or issue stop commands when set limits are exceeded, making it a dedicated component for industrial automation safety loops. Because it combines monitoring and signal handling in one enclosure, it suits machine sections where panel space is limited and fast safety response is required.
The unit is designed for monitoring 1 axis, so configuration focuses on a single drive or linear stage. All logic circuits operate from a 24 VDC supply, and the safety architecture satisfies SIL 3 in IEC 61508 together with the machine-safety PL e rating from ISO 13849-1. There are 12 safe digital inputs for door switches, light curtains, or emergency buttons, each evaluated at the internal clock rate. Encoder feedback enters at the front panel where SSI, SIN/COS, Incremental-TTL, or Resolver formats are accepted, while Proxi-Switch and Incremental-HTL signals can be wired on the terminal side. This range of supported feedback types helps the module work with both newer motion hardware and existing feedback devices already installed on machinery. The housing has an IP 52 rating, and its 100 × 115 × 45 mm outline fits DIN rail channels without obstructing adjacent modules.
Continuous load on the internal rails is limited to 2.4 W, keeping temperature rise low in densely packed cabinets. The signal processor accepts HTL edges up to 10 kHz, incremental channels up to 200 kHz, and resolver excitation to 600 Hz, so high-resolution velocity or position sources can be verified without underrange errors. Its probability of dangerous failure per hour is 1.2 × 10⁻⁹, and the proof-test interval is 20 years. With a mass of 390 g, the module adds little static load to lightweight service enclosures, and the low-power design supports compact cabinet layouts where heat buildup must be controlled.
Frequently Asked Questions about KSM 121-2:
Q: How many axes can the KSM 121-2 safety solution module monitor?
A: The KSM 121-2 supports monitoring for a single axis.
Q: How many safe digital inputs are available on the KSM 121-2?
A: This module provides 12 safe digital inputs for control system integration.
Q: What ingress protection rating does the KSM 121-2 offer?
A: The KSM 121-2 features an ingress protection rating of IP 52.
Q: What types of encoders can be connected to the front of the KSM 121-2 module?
A: Supported front encoder types include SSI, SIN/COS, Incremental TTL, and Resolver.
Q: What is the supply voltage required for the KSM 121-2?
A: This module operates with a 24 VDC supply voltage.
