Other signal modules
7.4 Position decoder module SM 338; POS-INPUT; (6ES7338-4BC01-0AB0)
S7-300 Automation System Module data
7-10 Manual, 08/2006, A5E00105505-04
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
• Diagnostic interrupt
programmable
Status display for digital inputs
Group error
LED (green)
LED (red)
Inaccuracy of the encoder value
Cyclic encoder value acquisition
• 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
Inaccuracy of the frozen encoder value (Freeze)
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)
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
Isochronous encoder value acquisition
• Jitter
Max. (frame transfer rate
n
+ programmed Monoflop time
n
)
n=0, 1, 2, (channel)
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