Siemens SIMATIC S7-300 Module data Reference Manual

Special Signal modules
5-15
Programmable Logic Controllers S7-300 Module Data
A5E00105505-03
5.4.9 SM 338; POS-INPUT Addressing
Data range for the encoder values
The inputs and outputs of the SM 338 are addressed as of the initial module
address. The input and output address is determined at the configuration of the
SM 338 in STEP 7.
Input Addresses
Table 5-4 SM 338; POS-INPUT: Input Addresses
Encoder input
Input address (from the configuration) + address offset
0 ”Initial module address”
1 ”Module start address” + 4 bytes address offset
2 ”Module start address” + 8 bytes address offset
Structure of the double data word
For each encoder input the double data word is made up as follows:
Encoder value in gray or binary code
Freeze
0 = encoder value is not frozen. The value is constantly updated.
1 = encoder value is frozen. The value remains constant until
acknowledgment.
31 0
Output Address
Acknowledging the freeze function:
Bit 0 = encoder input 0
Bit 1 = encoder input 1
Bit 2 = encoder input 2
Initial module address
07
Reading out data areas
You can read out the data areas in your user program with the STEP 7-Operation L
PED “xyz”.

Siemens SIMATIC S7-300 Module data Specifications

General

Series	S7-300
Manufacturer	Siemens
Protection Class	IP20
System	SIMATIC S7-300
Digital Inputs	Varies by module
Digital Outputs	Varies by module
Analog Inputs	Varies by module
Analog Outputs	Varies by module
Central Processing Unit	Varies by CPU model
Supply Voltage	24V DC or 120/230V AC
CPU Type	Varies (e.g., CPU 312, CPU 315, etc.)
Memory	Varies by CPU model
Communication Interfaces	MPI, PROFIBUS
Programming Languages	LAD, FBD, STL, SCL, GRAPH
Operating Temperature	0°C to 60°C
Storage Temperature	-40°C to 70°C
Relative Humidity	10% to 95% (non-condensing)