Siemens SIMATIC S7-300 FM 350-1, Manual

Page: 51 / 198

Programming the FM 350-1
5.5 Application example
FM 350-1 Counter module
Manual, 05/2011, A5E03648639-01
51
STL Explanation
CONT ... // Continue with normal execution
AN L_DIRECT; // Load direct function is ready
S SW_GATE; // Open software gate;
END:
Description of the Symbols
The table lists the symbols used in the example. You define your own symbol assignments in
the S7 Symbol Table.
Table 5- 10 Symbols in Example
Symbols Absolute
(Example) Comments
CNT_CHAN1 DB 1 Data block for CNT_CTL1 function
CNT_CHAN1.LOAD_VAL DB1.DBD14 Counter value specification in DB 1 (double word)
TRIGGER M 10.0 Trigger memory marker formed as a result of the technological
requirement
SW_GATE M 20.0 Start counter
GATE_STP M 20.1 Close counter gate
OT_ERR_A M 20.2 Acknowledge operator error
SET_DO0 M 20.3 Set output DO1
SET_DO1 M 20.4 Set output DO2
OT_ERR M 20.5 Operator error occurred
L_DIRECT M 20.6 Direct and preparatory loading of counter value
L_PREPAR M 20.7 Load value of counter in preparation
T_CMP_V1 M 21.0 Load comparison value 1
T_CMP_V2 M 21.1 Load comparison value 2
C_DOPARA M 21.2 Initiate parameter change
RES_SYNC M 21.3 Reset synchronization status bit
RES_ZERO M 21.4 Reset zero pass, overflow, underflow and comparator or end of
measurement status bit
CNT_CHAN1.OT_ERR_B DB1.DBB40.0 Operator error information in DB 1