Siemens FM 450-1 - Page 42

Name Declaration type Data type Meaning The user... The block...
L_DIRECT IN-OUT BOOL Trigger bit for "direct loading"
of a counter
sets queries and resets
this
L_PREPAR IN-OUT BOOL Trigger bit for "preparatory
loading" of a counter
sets queries and resets
this
T_CMP_V1 IN-OUT BOOL Transfer trigger bit for "com‐
parison value 1"
sets queries and resets
this
T_CMP_V2 IN-OUT BOOL Transfer trigger bit for "com‐
parison value 2"
sets queries and resets
this
RES_SYNC IN-OUT BOOL Delete "synchronization" sta‐
tus bit
sets queries and resets
this
RES_ZERO IN-OUT BOOL Reset status bits for zero
crossing, over󹪞ow, under‐
󹪞ow and comparator or
measurement end
sets queries and resets
this
Processing jobs
You initiate a job for the FM 450-1 by means of the L_DIRECT, L_PREPAR, T_CMP_V1, T_CMP_V2,
RES_SYNC, RES_ZERO, OT_ERR_A and GATE_STP FC parameters.
Depending on the job you must enter the load value or a comparison value into the instance DB
prior to the calling the FC.
A set in/out parameter (L_DIRECT, L_PREPAR, T_CMP_V1, T_CMP_V2, RES_SYNC and RES_ZERO)
is deleted again by the FC CNT_CTRL after the job has been completed. This enables you to
recognize that the job has been completely executed by the FM 450-1 and, if necessary, to
evaluate this information in the user program.
Startup characteristics
As soon as the FC CNT_CTRL identi󹪝es a startup (CPU or FM startup), a pending job is deferred
and the startup is acknowledged. Any job you have already initiated is carried out once the
startup is 󹪝nished and is therefore not lost.
Error Messages
If an operator error occurred when the FC is called, it is reported in the OT_ERR parameter. You
can read the error information in the DB 1 (variable OT_ERR_B). Thereafter you can acknowledge
the operator error with the OT_ERR_A parameter. No new operator error will be reported until
you have acknowledged the previous one.
Program
6.2 The FC CNT_CTRL function
Counter module FM 450-1
42 Equipment Manual, 03/2022, A5E03648739-AC