Compact speed monitors: IO-Link benefits

The sensor provides a lot of information via IO-Link:

• Speed values
• Minimum and maximum values
• Switch points

IO-Link enables convenient parameter setting, for example of:

• Start-up delay
• Operating mode (single point mode, window mode, two point mode)
• Convenient setting of the switch points via teach function

With the help of the setting ring, the sensor can also be adjusted manually on site.

Adjustable start-up delay

Rotating equipment takes time to ramp up to the operating speed. During this time, a speed monitor without a start-up delay would provide false signals. The factory default start-up delay can be found on the datasheet of the specific sensor. Using IO-Link, the start-up delay can be adjusted from 0…30 s.

Background compensation

Inductive speed sensors operate as typical inductive sensors, with an electromagnetic field radiating from the sensor face. When that field is interrupted, or damped, the output switches.

ifm’s speed sensors with IO-Link can be taught to ignore predamping. The background suppression is based on a distance, so uneven metallic backgrounds do not cause the sensor to switch.

Teach offset

This parameter allows the setting of an offset between the taught process value and the resulting switching value. Example:

• Nominal speed of motor = 3600 rpm
• Offset = 80%
• Switch point is automatically set at 2880 rpm (3600 x 0.80)

Prescaler

The prescaler is a divider used to calculate the actual rpm as the process data value (PDV) in applications where multiple target are used.