K621 Discrete IO Expansion

The PLC-K621 series of Discrete Input Expansion Modules are offered with either 8 or 16 inputs. These modules are attached to the PLC-K6 CPUs to expand beyond the onboard inputs. The PLC-K6 CPU series can handle up to 264 I/O points with a maximum of 14 expansion modules. If a user were to select the PLC-K6, equipped with 40 I/O points, and an additional 14 PLC-K621- 16DX units, the user would achieve the maximum 264 I/O points within the constraint of 6 expansion modules. The PLC-K621-__DX modules come with the option to either sink or source the inputs; each input is rated for 3.5 mA. All modules are opto-isolated so units are not damaged.




  • 8 or 16 Inputs
  • Sinking or Sourcing Configuration
  • Rated for 3.5 mA @ 24 VDC
  • Inputs are Opto-isolated
  • LED Display to Monitor Running Conditions
  • Easy Maintenance and Installation

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K621-08DX Expansion Module,
Discrete Inputs
8 N/A Sinking or Sourcing N/A Click here for PDF Spec Sheet Click here to request a Quote. $53.00 view here
Quantity Discounts
1pc. $53.00
10pc. $49.73
25pc. $47.47
50pc. $46.07
100pc. $44.60
Contact Us for Quantities over 100
Typ. 10 Days Contact Us
K621-16DX Expansion Module,
Discrete Inputs
16 N/A Sinking or Sourcing N/A Click here for PDF Spec Sheet Click here to request a Quote. $77.00 view here
Quantity Discounts
1pc. $77.00
10pc. $72.46
25pc. $69.17
50pc. $67.13
100pc. $64.83
Contact Us for Quantities over 100
Typ. 10 Days Contact Us

IMPORTANT NOTE: When stock status reads "contact us," the lead time could range from 6 to 16 weeks, model dependent. Please contact the factory for more details.

  • K621-08DX Wiring
  • K621-16DX Wiring
  • K621-08DX Dimensions
  • K621-16DX Dimensions