Home > Products > SIEMENS > SIMATIC S7 Series
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CHANNELS
2 counting / positioning channels
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ENCODERS
RS422 incremental or SSI absolute
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SUPPLY
24 V DC
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I/O
4 DI and 4 DQ total
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LEAD TIME
In stock |
WARRANTY
1 year |
COUNTERS
2 channels
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INCREMENTAL INPUT
Up to 1 MHz
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ENCODER SUPPLY
5 V and 24 V
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DIGITAL I/O
4 DI / 4 DQ
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Complete model
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6ES7551-1AB00-0AB0
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Brand
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Siemens
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Product family
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SIMATIC S7-1500
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Product type
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TM PosInput 2 technology module
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Number of channels
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2
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Rated supply voltage
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24 V DC
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Permissible supply range
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19.2 to 28.8 V DC
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Current consumption
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75 mA maximum without load
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Power from backplane bus
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1.3 W
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Power loss
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5.5 W typical
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Encoder supply
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5 V DC and 24 V DC, 300 mA per channel
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Digital inputs
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4 total, 2 per channel, Type 3
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Digital outputs
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4 transistor outputs, 2 per channel, 0.5 A each
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Incremental encoder interface
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RS422; input rate up to 1 MHz
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SSI encoder interface
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RS422 for absolute encoders
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Shielded cable length
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Up to 1,000 m
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Unshielded cable length
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Up to 600 m
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Operating temperature
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Horizontal: 0 to +60 °C; vertical: 0 to +40 °C
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Dimensions (W × H × D)
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35 × 147 × 129 mm
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Weight
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Approx. 325 g
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POSITION FEEDBACK
Reads incremental encoder signals for position and path acquisition.
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ABSOLUTE POSITION
Connects SSI absolute encoders for direct position values.
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HIGH-SPEED COUNTING
Processes incremental input signals at rates up to 1 MHz.
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LOCAL CONTROL
Digital inputs and outputs support gate, capture, comparison and switching functions close to the module.
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COUNTER MODES
Supports endless counting, single counting and periodic counting.
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POSITION DETECTION
Incremental and absolute acquisition modes are available according to the connected encoder.
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MEASURING MODES
Frequency, period and velocity measurements are parameterizable.
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COMPARATORS
Two comparators per channel can drive outputs from configured counter or position thresholds.
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MOUNTING
Install on an S7-1500 mounting rail with 35 × 147 × 129 mm space available.
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ENCODER POWER
Select the specified 5 V or 24 V encoder supply; each channel provides up to 300 mA.
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CABLING
Use shielded encoder cable for runs up to 1,000 m; unshielded cable is specified up to 600 m.
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CHANNEL WIRING
Each channel provides two digital inputs and two transistor digital outputs for application signals.
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HORIZONTAL MOUNTING
Specified from 0 to +60 °C; observe the data-sheet derating note for inductive loads.
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VERTICAL MOUNTING
Specified from 0 to +40 °C.
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ISOLATION TEST
Isolation is tested at 707 V DC as stated in the data sheet.
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STATUS INDICATION
Green RUN, red ERROR and yellow MAINT LEDs support local diagnostics.
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