D300717 1211 - BL20 I/O modules
10-17
Module BL20-1CNT-24VDC
The upper limit must be greater than the lower limit. An error is indicated by the ERR_LOAD status bit
via the check-back interface/process input. The status bit is cleared when a valid value is entered.
Revolutions measurement
Definition
In this operating mode, the counter module counts the pulses received from a rotary sensor within a
predefined integration time. The number of "sensor pulses per revolution" must be defined beforehand
by parameters in the system. The number of "sensor pulses per revolution" and the pulses counted
determine the speed of the connected motor.
The integration time is defined by measuring parameters. It can be set in 10 ms increments to between
10 ms and 10 s.
The speed is indicated in units of 1 × 10
-3
rpm.
Limit value monitoring
The limit values can be configured and defined at a later time via the control interface/process output.
The following limit value ranges are possible:
Range defined by parameters
→
The value range is restricted by the 3 byte parameter length
Lower limit n
u
is 0 to 16 777 214 × 10
-3
rpm
Upper limit n
o
is 1 to 16 777 215 × 10
-3
rpm
The upper limit must be greater than the lower limit. The diagnostics messages Upper limit wrong and
Lower limit wrong indicate parameter definitions that are outside of the permissible value range. The
diagnostics messages are cleared when valid parameters are entered.
Range defined via the control interface/process output
(LOAD_UPLIMIT/LOAD_LOLIMIT)
Lower limit n
u
is 0 to 24 999 999 × 10
-3
rpm
Upper limit n
o
is 1 to 25 000 000 × 10
-3
rpm
Table 10-4:
Possible
measuring ranges
Integration time
f
min
f
max
10 s
0.1 Hz
200000 Hz
1 s
1 Hz
200000 Hz
0.1 s
10 Hz
200000 Hz
0.01 s
100 Hz
200000 Hz
Figure 10-10:
Revolutions
measurement
with release
function
Count
signals
Integration time
Start of rotational
speed measurement
End of rotational
speed measurement
n*10 ms
n*10 ms
Internal
release
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