turck BL20 Series - 12.1.5 Operation modes; 12.1.6 Selecting counter or measurement mode

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2020/09
12.1.5 Operation modes
The BL20 counter module offers the connection of a pulse generator for measuring 24 VDC signals
(11…30 VDC), up to a frequency of 200 kHz.
Moreover, the module provides the sensor with 24 VDC.
The electronics module supports the following operating modes:
Count modes:
 Continuous count
 Single count
 Periodical count
Measurement modes:
 Frequency measurement
 Revolutions speed measurement
 Period duration measurement
Each of the operating modes have individual parameters assigned to them. The relevant parameter
lists are specified in more detail in the descriptions of the integration in the fieldbus systems.
The counter module is provided with a digital output that is used for direct control of the process or
for indicating comparison results.
The digital input of the counter module is used for initiating the hardware release signal, the syn-
chronization or latch and retrigger function.
The BL20 counter module can process signals generated from the following sensors:
 24 VDC pulse generator with direction signal
 24 VDC pulse generator without direction signal
 24 VDC pulse generator with two 90° offset channels (rotary sensor)
12.1.6 Selecting counter or measurement mode
Profibus-DP:
The GSD file provides 2 module codes the BL20-1CNT-24VDC modules.
For count mode select modules with code C
For measurement mode select modules with code M.
DeviceNet:
The attribute no. 113 must be written first and determines the operating mode.
The write operation to attribute no. 113 resets all other attributes to the default values!
CANopen:
Object 5800hex controls the operating mode parameters of the BL20 counter module. Its use
includes the setting of count mode or measurement mode.