KL3021-0000 Beckhoff
Wake Industrial LLC is not an authorized distributor of this product.
The Beckhoff KL3021-0000 is part of the KL Analog Input Modules series and features a single differential input with 12-bit resolution, accepting a signal current range of 4 to 20 mA. It has an internal resistance of 80 Ohms plus 0.7 V and mounts on a 35 mm DIN rail. The module operates with a common-mode voltage of up to 35 V and is rated IP20 for protection.
Internal Product Review
The KL3021-0000 is a Beckhoff analog input module with differential input technology and 12-bit resolution. For process signals, the 4 to 20 mA input range and measurement error below ±0.3% FS support dependable analog acquisition. DIN rail mounting and IP20 protection make this module a strong choice for controlled cabinet installations.
To contact sales for pricing and lead time:
Payment Methods
Shipping Methods
Our Credentials
Product Description:
The KL3021-0000 is an analog input terminal produced by Beckhoff within the KL Analog Input Modules series. Installed on Beckhoff I/O stations, it converts a process current into a digital value so a controller can monitor transmitters, valve positioners, or other field devices that use current loops. This lets analog process signals be handled alongside discrete I/O in the same terminal assembly. By housing the conversion circuitry in a 12 × 100 × 68 mm terminal, the module supports compact signal acquisition on a machine's DIN rail and helps reduce cabinet depth in distributed automation layouts. Because the terminal format is modular, other signal terminals can be placed beside it on the same rail without changing the overall station structure.
This module accepts a loop signal of 4–20 mA and digitizes it with 12-bit resolution. The conversion hardware has a typical K-bus current draw of 60 mA, so no separate field supply is required for the electronics. It clips onto a 35 mm DIN rail, and the housing has an IP20 rating that protects against accidental finger contact but is not sealed against dust. The input path uses a differential input circuit to reduce the effect of ground offsets, and the overall measurement error remains below ±0.3% of full scale. One input channel is provided, and no power contacts are routed through the terminal, which keeps the module focused on signal conversion rather than pass-through power distribution. This arrangement is useful when cabinet space is limited and analog monitoring must fit into a dense I/O row.
A common-mode limit of 35 V maximum helps protect connected transducers, and the signal path presents an internal burden of 80 Ω + 0.7 V for predictable loop-compliance calculations. Digital data are forwarded on the fieldbus as a 1 × 16-bit value + 1 × 8-bit optional status byte, allowing the control program to read the measured value and optional status information during each cycle. Power for the conversion circuitry is supplied only through the K-bus, which keeps external wiring simple inside compact control enclosures. The terminal also tolerates surge events up to 35 V DC without damage, which supports stable operation when connected field wiring is exposed to brief electrical disturbances.
