Siemens simatic s7-400 FM 450-1, User Manual, Page: 49 / 130

Program
6.5 Technical specifications of the blocks
Counter module FM 450-1
Manual, 02/2014, A5E03648739-02
49
Name Declaration type Data type Meaning The user... The block...
RES_SYNC IN-OUT BOOL Delete "synchronization"
status bit
sets queries and
resets this
RES_ZERO IN-OUT BOOL Reset status bits for zero
crossing, overflow,
underflow 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 identifies 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 finished 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.