Siemens SIMATIC User Manual

Other signal modules
7.4 Position decoder module SM 338; POS-INPUT; (6ES7338-4BC01-0AB0)
S7-300 Module data
512 Manual, 06/2017, A5E00105505-AJ
7.4.8 Technical data of SM 338; POS-INPUT
Technical data of SM 338; POS-INPUT
Technical data
Dimensions and weight
Dimensions W x H x D (mm) 40 x 125 x 120
Weight
Approx. 235 g
Voltages, currents, electrical potentials
Rated load voltage L+
• Range
• Reverse polarity protection
24 VDC
20.4 ... 28.8 V
No
Electrical isolation
No, only to shield
Maximum potential difference
• Between the input (M terminal) and CPU grounding bus-
bar
1 VDC
Encoder supply
• Output voltage
• Output current
L+ -0.8 V
Max. 900 mA, short circuit-proof
Current consumption
• from the backplane bus
• from load voltage L+ (no load)
Max. 160 mA
max. 10 mA
Power loss of the module
Typ. 3 W
Encoder inputs POS-INPUT 0 to 2
Position detection
Absolute
Difference signals for SSI data and SSI clock
To RS422 standard
Data transfer rate and cable (twisted-pair and shielded)
length of absolute value encoders
• 125 kHz max. 320 m
• 250 kHz max. 160 m
• 500 kHz max. 60 m
• 1 MHz max. 20 m
SSI frame transfer rate
• 125 kHz
• 250 kHz
• 500 kHz
• 1 MHz
13 bits
112 µs
56 µs
28 µs
14 µs
21 bits
176 µs
88 µs
44 µs
22 µs
25 bits
208 µs
104 µs
52 µs
26 µs
Monoflop time
2
16 µs, 32 µs, 48 µs, 64 µs

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)