Siemens FM 450-1 - Page 74

Setting the counter with the zero mark
If you assign the parameters for setting a counter with the zero mark of the encoder, the relevant
counter is set with the rising edge of the zero mark.
Setting is only performed if input 1I2 (2I2) of the relevant counter is set at the time of the rising
edge of the zero mark.
With the ENSET_UP and ENSET_DN variable is the DB of the FC CNT_CTRL and by assigning
parameters, you specify the behavior of the respective FM 450-1 counter in the case of a rising
edge of the zero mark.
Bit Behavior of the FM 450-1 counter
ENSET_UP set The counter is only set in the case of up counting.
ENSET_DN set The counter is only set in the case of down counting.
ENSET_UP and ENSET_DN
set
Counter is set for up and down counting.
Parameter assignment Behavior of the FM 450-1 counter
Parameter assignment
"single setting of counter"
The counter is set only at the 󹪝rst rising edge of the zero mark.
If the counter is to be set again, you must 󹪝rst set ENSET_UP or ENSET_DN
again (edge evaluation). The counter is then set again with the next rising
edge of the zero mark.
Parameter assignment
"multiple setting of coun‐
ter"
As long as ENSET_UP and/or ENSET_DN are set, the counter will be set with
each rising edge of the zero mark.
Note
It is imperative that you set one of the two variables, ENSET_UP or/and ENSET_DN and input 1I2
(2I2) so that the relevant counter can be set with the zero mark.
Single setting with the zero mark
The following 󹪝gure shows counter 1 being set once with the zero mark. In the case represented
here, only ENSET_UP is set, i.e., the counter is set during up counting.
The relevant counter is set with the 󹪝rst rising edge of the zero mark as long as ENSET_UP and
input 1I2 are set.
If you want to set counter°1 again, you must reset ENSET_UP and then set it again. If input 1I2
is not set, setting is performed with the 󹪝rst zero mark after setting 1/2. If input 1I2 is set, setting
takes place with the next zero mark.
The situation is analogous for counter 2 with input 2I2.
Modes, settings, parameters and commands
8.11 Command: Set counter
Counter module FM 450-1
74 Equipment Manual, 03/2022, A5E03648739-AC