Siemens SIMATIC User Manual

Other signal modules
7.4 Position decoder module SM 338; POS-INPUT; (6ES7338-4BC01-0AB0)
S7-300 Module data
Manual, 06/2017, A5E00105505-AJ
507
7.4.5 Addressing SM 338 POS-INPUT
Data areas for encoder values
The SM 338 inputs and outputs are addressed beginning at the module start address. The
input and output address is determined in your configuration of SM 338 in
STEP 7 .
Input addresses
Table 7- 4 SM 338; POS-INPUT: Input addresses
Encoder input
Input address (derived from configuration) + address offset
0
"Module start address"
1 "Module start address" + 4 byte address offset
2
"Module start address" +8 byte address offset
Structure of double data word in Standard Mode
Double data word structure of the encoder inputs:
Structure of double data word in Fast Mode
Double data word structure of the encoder inputs:
In the double data word from channel 0, the status of digital input I0 is reported to bit 27
(digital input status) and the double data word from channel 1 is reported to digital input I1.
In the double data word from channel 2, the bit is always = 0.

Siemens SIMATIC Specifications

General

Brand	Siemens
Model	SIMATIC
Category	Control Unit
Language	English