Output mode

Operation mode selection and output pattern

Apart from the operating mode FM (Frequency Modulation, index “Operation mode” 0x8000:0E or 0x8010:0E = 0_dec), the EL2521 can also be used for stepper motor control with pulse-direction control (Frq-Cnt pulse mode, index 0x8000:0E or 0x8010:0E = 1_dec).

A further operation mode is incremental encoder simulation (index 0x8000:0E or 0x8010:0E = 2_dec). It is possible to connect the terminal output directly to an incremental encoder input, with which many servo drives and frequency converters are equipped. The pulse pattern is output through channels A and B. The necessary operation mode can be configured via the feature object 0x8000:0E or 0x8010:0E.

The operation modes differ primarily between the

• positive logic mode 0, 1, 2 and
• negative logic mode 4, 5, 6.
  The negative logic can be activated with index “Negative logic” 0x8000:0F or 0x8010:10.

Operation modes 2 and 6 simulate an incremental encoder, and permit direct connection to an evaluation unit such as a servo drive or frequency converter with an incremental encoder input.