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
513
Technical data
Digital inputs DI 0, DI 1
Electrical isolation No, only to shield
Input voltage 0 signal -3 V ... 5 V
1 signal 11 V ... 30.2 V
Input current 0 signal ≤ 2 mA (standby current)
1 signal 9 mA (typ.)
Input delay 0 > 1: max. 300 μs
1 > 0: Max. 300 μs
Maximum repetition rate
1 kHz
Connection of a two-wire BEROS, type 2
Supported
Shielded cable length
600 m
Unshielded cable length
32 m
Status, interrupts, diagnostics
Interrupts
• Diagnostics interrupt
programmable
Status display for digital inputs
Group error
LED (green)
LED (red)
Inaccuracy of the encoder value
Free-running transducer capture (Standard Mode)
• maximum age
1
• minimum age
1
• Jitter
(2 × frame transfer rate) + monoflop time + 580 µs
Frame transfer rate + 130 µs
Frame transfer rate + monoflop time + 450 µs
Refresh rate
Frame evaluation at intervals of 450 µs
Free-running transducer capture (Fast Mode)
• maximum age
1
• minimum age
1
• Jitter
(2 × frame transfer rate) + monoflop time + 400 µs
Frame transfer rate + 100 µs
Frame transfer rate + monoflop time + 360 µs
Refresh rate
Frame evaluation at intervals of 360 µs
Isochronous encoder value acquisition
• Age
Encoder value at time T
i
of the current PROFIBUS DP cycle
Inaccuracy of the frozen encoder value (Freeze)
Cyclic encoder value acquisition (Standard Mode)
• maximum age
1
• minimum age
1
• Jitter
(2 × frame transfer rate) + monoflop time + 580 µs
Frame transfer rate + 130 µs
Frame transfer rate + monoflop time + 450 µs
Isochronous encoder value acquisition
• Jitter
Max. (frame transfer rate
n
+ programmed Monoflop time
n
)
=0, 1, 2, (channel)

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)