Siemens SIMATIC S7-300 FM 350-1, Руководство пользователя

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Programming the FM 350-1
5.2 The function FC CNT_CTL1 (FC 2)
FM 350-1 Counter module
Manual, 05/2011, A5E03648639-01
45
Time Required to Transfer Values
Table 5- 6 Time Required to Transfer Values
Use of the FM 350-1 Time requirement
Centralized At least 4 OB 1 cycles
Distributed
(Non-isochronous mode) At least 5 PROFIBUS DP cycles
At transmission of
only one value
5 PROFIBUS DP cycles Distributed
(Isochronous mode)
At simultaneous
initiation of the
transmission of
several values

for the 1st value: 5 PROFIBUS DP cycles after initiation

for the 2nd value: 6 PROFIBUS DP cycles after initiation

for the 3rd value: 7 PROFIBUS DP cycles after initiation
Parameters for Transferring Values in the DB (Count Modes)
The following table shows the range of the DB in which you transfer the LOAD_VAL,
CMP_V1 and CMP_V2 parameters.
The LOAD_VAL parameter (bytes 14 to 17) has two meanings:
●
If you set function parameter L_DIRECT or L_PREPAR, LOAD_VAL is interpreted as a
load value.
● If you set function parameter C_DOPARA, you can use Byte 14 to define the behavior of
outputs DO0 and DO1. Bytes 15 and 16 are interpreted as hysteresis and pulse duration.
Table 5- 7 Parameters for Transferring Values in the DB (Count Modes)
DB address Parameters Meaning
14.0 LOAD_VAL Load value; direct and preparatory loading with function parameter L_DIRECT
Load value; preparatory loading with function parameter L_PREPAR
The behavior of outputs DO0 and DO1, hysteresis and pulse duration, are defined using
function parameter: C_DOPARA
Bit 3
Bit 2 Bit 1 Bit 0 Reaction of output DO0
x 0 0 0 Inactive
x 0 0 1 Active from comparison value to overflow
x 0 1 0 Active from comparison value to underflow
x 0 1 1 Active on reaching the comparison value for pulse
duration (up/down)
x 1 0 0 Active on reaching the comparison value for pulse
duration (up)
14.0 LOAD_VAL
x 1 0 1 Active on reaching the comparison value for pulse
duration (down)