Pilz PSSu E S 2AI RTD - Manual (Page 20)

Function description
Operating Manual PSSu E S 2AI RTD(­T)
22017­EN­06 20
4.2.9 PSSu assignment in system environment A
Each input occupies 16 consecutive bit addresses for the input data. Each input occupies
an additional 8 consecutive bit addresses for the status byte, where this has been con­
figured for the input. All the status bytes are displayed first in the PII, followed by the input
data.
Configuration Standard bus system
Input data
ST­PII ST­PIO
32 Bit ­ ­ ­
Input data and status byte
("X") 48 Bit ­ ­ ­
Bit sequence in the PII, input data only, no status byte:
Input PII Assignment
Input I0 1 LSB input data
... ...
16 MSB input data
Input I1 17 LSB input data
... ...
32 MSB input data
Bit sequence in the PII, input data and status byte:
Input PII Assignment
Input I0 1 LSB status byte
... ...
8 MSB status byte
Input I1 9 LSB status byte
... ...
16 MSB status byte
Input I0 17 LSB input data
... ...
32 MSB input data
Input I1 33 LSB input data
... ...
48 MSB input data
4.2.9.1 Status byte
ST modules for measuring temperature can transfer a variety of status information to the
ST­PII (see table below for the conveyed status). The information is transmitted using the
input's status byte. Read access (R) is configured for the input for that purpose.