Siemens SIMATIC CP 340 User Manual page 157

Description of "reading and controlling the CP 340 inputs/outputs"
The "read and control RS 232C accompanying signals" functions can only be carried out
with the ASCII driver. A prerequisite is that you have not set the "Automat. control of V24
signals" parameter on the "Transfer" tab.
To enable the CP 340 inputs/outputs to be read and controlled, input I 0.0 must be showing
the "0" signal and input I 0.1 the "1" signal. The signal states SET_DTR and SET_RTS can
be preselected by means of inputs I 1.6 and I 1.7. When the signal at I 0.7 changes from "0"
to "1", this state is transferred to the CP by the V24_SET function.
The V24_STAT standard function is called cyclically. The state of the CP 340 inputs/outputs
is displayed at output byte QB 5.
Description of "printing"
To enable printing, input I 0.0 must be showing the "0" signal and input I 0.1 the "1" signal.
Inputs I 1.0, I 1.1, I 1.2, and I 1.3 allow you to select between four PRINT jobs. The PRINT
jobs are located in data block DB 30. This points to the actual data (variables 1 to 4 and the
format string) to be sent to the CP 340.
Job 1 sends the data of variables 1 to 4 and the format string. Data is read as follows:
● Variable 1 is read from DB 31 starting at data double word DBD 0
● Variable 2 is read from DB 32 starting at data word DBW 0
● Variable 3 is read from DB 33 starting at data word DBW 0
● Variable 4 is read from DB 34 starting at data word DBW 0
● Format string is read from DB 35 from DBB 2 to DBB 43
Job 2 sends the data of variables 1 to 4 and the format string. Data is read as follows:
● Variable 1 is read from DB 31 starting at data double word DBD 8
● Variable 2 is read from DB 32 starting at data word DBW 2
● Variable 3 is read from DB 33 starting at data word DBW 2
● Variable 4 is read from DB 34 starting at data word DBW 2
● Format string is read from DB 35 from DBB 2 to DBB 43
Job 3 sends the data of variables 1 to 4 and the format string. Data is read as follows:
● Variable 1 is read from DB 31 starting at data double word DBD 16
● Variable 2 is read from DB 32 starting at data word DBW 4
● Variable 3 is read from DB 33 starting at data word DBW 4
● Variable 4 is read from DB 34 starting at data word DBW 4
● Format string is read from DB 35 from DBB 2 to DBB 43
Job 4 sends the data of variable 1 and the format string. Data is read as follows:
● Variable 1 is read from DB 31 starting at data double word DBD 24
● Format string is read from DB 35 from DBB 68 to DBB 111
PtP coupling and configuration of CP 340
Manual, 04/2011, A5E00369892-03
Programming Example for Standard Function Blocks
9.7 Activation, Start-Up Program and Cyclic Program
157