Download 4 - Siemens

Addressing, Parameter Assignment and Function of the C7 Input/Output
4.3.2
Parameter Assignment for Analog I/O
Overview
This chapter contains an overview of the analog I/O and their parameters.
Parameter
Assignment
You set the parameters for the analog I/O using the S7 Hardware
configuration. A parameter block is generated that contains all selected
peripheral parameters. After loading the SDB parameter, the parameters are
not immediately transferred to the analog I/O. The C7-CPU then transfers the
parameters to the respective analog I/O after every mode change from
STOP!RUN.
Alternatively, you can also change some parameters in the application
program with the SFC 55 to 57 (see Reference Manual /235/).
4
We subdivide the parameters for the two configuration alternatives into:
S Static parameters and
S Dynamic parameters
The following table explains when the static and dynamic parameters are
adopted.
Table 4-1
Time of Transfer of the Parameters from the C7-CPU to the Analog I/O
Parameter
Assignment of
Parameters for
Characteristics
Set with
Time of Parameter
Transfer
Static
Hardware configuration
STOP -> RUN
Dynamic
Hardware configuration
STOP -> RUN
SFC 55 to 57
RUN
The following parameter blocks permit the assignment of parameters in S7
Hardware configuration to define the following characteristics of the analog
I/O:
S For inputs
– Basic setting
– Diagnostics
– Measurement
– Alarm cycle
S For outputs
– Basic setting
– Diagnostics
– Substitute values
– Output range
Analog Input
Parameters
Table 4-2 provides an overview of the analog input parameters.
C7–623, C7–624 Control Systems
C79000-G7076-C624-01
4-7