YASKAWA CPU 013C, Manual

Page: 131 / 263

5.7.3 Proceeding
In the Siemens SIMATIC Manager the following steps should be executed:
1. Perform a hardware configuration for the CPU.
Ä
Chapter 4.4 ‘Hardware configura-
tion - CPU’ on page 61
2. Double-click the counter sub module of the CPU 314C-2 PN/DP.
ð
The dialog ‘Properties’ is opened.
3. As soon as you select the operating mode for the corresponding channel, a dialog
box with default values for this counter mode is created and shown. Select for the
corresponding channel the operating mode ‘Frequency counting’ . Ä Chapter 5.6.6
‘Counter operating modes’ on page 115
4. Perform the required parameter settings.
5. Safe your project with ‘Station è Safe and compile’ .
6. Transfer your project to your CPU.
n The
Ä
Chapter 5.7.4 ‘SFB 48 - FREQUENC - Frequency measurement’ on page 131
should cyclically be called (e.g. OB 1) for controlling the frequency measurement.
n The SFB is to be called with the corresponding instance DB. Here the parameters of
the SFB are stored.
5.7.4 SFB 48 - FREQUENC - Frequency measurement
The SFB 48 is a specially developed block for compact CPUs for frequence measure-
ment.
n The SFB FREQUENC should cyclically be called (e.g. OB 1) for controlling the fre-
quency measurement.
n The SFB is to be called with the corresponding instance DB. Here the parameters of
the SFB are stored.
n Among others the SFB 48 contains a request interface. Hereby you get read and
write access to the registers of the frequency meter.
n So that a new job may be executed, the previous job must have be finished with
JOB_DONE = TRUE.
n Per channel you may call the SFB in each case with the same instance DB, since the
data necessary for the internal operational are stored here. Writing accesses to out-
puts of the instance DB is not permissible.
n
With the SFB FREQUENC (SFB 48) you have following functional options:
–
Start/Stop the frequency meter via software gate SW_GATE
– Read the status bit
– Read the evaluated frequency
– Request to read/write internal registers of the frequency meter.
Name Declaration Data type Address
(Inst.-DB)
Default value Comment
LADDR INPUT WORD 0.0 300h This parameter is not evaluated.
Always the internal I/O periphery
is addressed.
CHANNEL INPUT INT 2.0 0 Channel number
SW_GATE INPUT BOOL 4.0 FALSE Enables the Software gate
Hardware configuration
User program
Description
Parameters
VIPA System SLIO
Deployment I/O periphery
Frequency measurement > SFB 48 - FREQUENC - Frequency measurement
HB300 | CPU | 013-CCF0R00 | en | 16-40 131