Siemens SIMATIC S5 User Manual

S5-115F Manual Blocks
If you want selective sampling, proceed as follows:
Set the function selector switch on the 460 AI to selective sampling.
Call FB 250 ANEI with Parameter EINZ = ”1”.
During coding, FB 250 ANEI will set the output parameters T Bit = ”1”. The result is available
when T Bit = ”0”.
If you want to scan the T Bit parameter, call FB 250 ANEI with EINZ = ”1”.
In the case of programmable controllers with the CPU 942-7UF13:
You cannot activate selective sampling on the relevant AI module as long as T BIT = 1.
Note
Assign different bits to the activity bit when different channels are called. You will
then be able to recognize which channel has been activated for coding.
FB 250 transmits a value XA within a (scaled) range defined by the user. The user defines the
desired range with the ”Upper limit” (OGR) and ”Lower limit” (UGR) parameters.
Scaling schematic:
Figure 6-1. Schematic Illustrating the Scaling of Analog Values
a a a a a a a a a
a a a a a a a a a
a a a a a a a a a
a a a a a a a a a
UGDR
0GDR
XA
0GR
a a a
a
a
a
a
a
a
a
a
a
a a a
0
Scaled
range
Nominal range
of the module
UGR
Analog value
EWA 4NEB 811 6149-02 6-5

Siemens SIMATIC S5 Specifications

General

Product type designation	SIMATIC S5
Programming language	STEP 5
Digital inputs	Varies by model
Digital outputs	Varies by model
Analog inputs	Varies by model
Analog outputs	Varies by model
Supply voltage	24V DC
CPU Type	Varies by model
Memory	Varies by model
Digital I/O	Varies by model
Analog I/O	Varies by model
Communication	PROFIBUS
Operating Temperature	0°C to 60°C
Relative Humidity	5% to 95% (non-condensing)