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
505
7.4.4 Parametrization SM 338 POS-INPUT
You parameterize the SM 338; POS-INPUT in STEP 7 . Always parameterize the module
while the CPU is in STOP mode.
After you completed the parameter assignment, download the parameters from the PG to the
CPU. At its next STOP → RUN transition, the CPU transfers the parameters to the SM 338.
New parameters can not be assigned by the user program.
Parameters of SM 338; POS-INPUT
The table below provides an overview of configurable parameters and defaults for the SM
338.
The defaults apply if you have not set any parameters in
STEP 7 (default setting bold).
Table 7- 3 Parameters of SM 338; POS-INPUT
Parameters
Range of values
Note
Enable
• Fast-Mode
yes /
no
Enable parameter.
Applies to all 3 channels.
Enable
• Diagnostic interrupt
yes /
no
Enable parameter.
Applies to all 3 channels.
Absolute value encoder (SSI)
1)
none;
13 bits
; 21 bits; 25 bits none: The encoder input is switched off.
Code type
1)
Gray
; Binary Code returned by the encoder.
Baud rate
1.3)
125 kHz
; 250 kHz; 500 kHz; 1 MHz Data transfer rate of the SSI position detection.
Observe the relationship between cable lengths
and the transmission rate (refer to chapter
"Technical data of SM 338; POS-INPUT
(Page 512)")

Siemens SIMATIC Specifications

General

Product type designation	SIMATIC
CPU	Varies by model
Memory	Varies by model
Input/Output	Varies by model
Communication	Varies by model
Programming Language	STEP 7
Operating Temperature	0°C to 60°C (varies by model)
Protection Class	IP20
Category	Programmable Logic Controller (PLC)