AS-Interface Analog Module
Operating the Modules
Subject to reasonable modifications due to technical advances
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5.4
Operation of the Pt100 Modules in IP20 and IP65
This chapter gives all necessary information which is needed to operate the Pt100
module
s
.
Presupposition: The AS-Interface Pt100 module supports AS-Interface analog
profile 7.3. Via AS-Interface four 16 bit values are transmitted from the Pt100 mo-
dule to the AS-Interface master. In order to operate the module, it is necessary to
use an AS-Interface master which supports analog profile 7.3.
It is necessary to attach at least one Pt100 sensor in order to start the A/D conver-
ter before switching on the slaves. Otherwise LED1, LED2, LED3, LED6 will blink
with a frequency of app. 5 Hz.
5.4.1
Slave Profile
Configuration of the Pt100 module is as follows:
• I/0- Code: 7
hex
• ID-Code: 3
hex
• ID2-Code:E
hex
5.4.2
Parameterization of the AS-Interface Pt100 Modules
The adjustment of differing operation ranges is known as parameterization. It is
done via the AS-Interface master by executing the command "write AS-Interface
parameter".
Parameter settings of AS-Interface Pt100 blocks can be adjusted as follows:
AS-Interface parameter bit 0: Filter for mains frequency:
The 50 Hz filter is valid in the whole of Europe.
AS-Interface parameter bits P1 and P2: Configuration of peripheral fault
messages of channels 1 to 4
By means of AS-Interface parameter bits P1 and P2 it is possible to adjust which
measuring channels of the module are active or not. Configuration only effects pe-
ripheral fault messages. Adjacent measuring parameters of all 4 channels are al-
ways transmitted via AS-Interface.
P0 filter in the A/D converter for
1
50 Hz (default)
0
60 Hz
peripheral fault can be caused by channel
P1
P2
1
2
3
4
0
0
yes
no
no
no
0
1
yes
yes
no
no
1
0
yes
yes
yes
no
1
1
yes
yes
yes
yes