SIEMENS PLC MODULES 6ES7551-1AB01-0AB0

About SIEMENS PLC MODULES 6ES7551-1AB01-0AB0

The Siemens PLC Modules 6ES7551-1AB01-0AB0 are high-quality industrial automation devices in a standard grey size. Designed to operate on electric power mode with a voltage specification of 220 Volt (V), these PLC modules are ideal for various industrial applications, guaranteeing optimal performance. With a new condition and a 1-year warranty, these modules offer reliability and longevity, making them a trusted choice for exporters, manufacturers, suppliers, and traders in the industrial automation sector.

Data sheet 6ES7551-1AB01-0AB0

SIMATIC S7-1500, TM PosInput 2

Counter and position detection module for RS-422 incremental encoder or SSI absolute encoder, 2 channels, 2 DI, 2 DQ per channel

General Information

• Product type designation: TM PosInput 2

• Firmware version: V2.0

• FW update possible: Yes

• Number of channels: 2

Product functions

• I&M data: Yes (I&M0 to I&M3)

• Isochronous mode: Yes

Engineering with

• STEP 7 TIA Portal: From V17

• PROFIBUS: GSD Revision 5

• PROFINET: Version V2.3

Installation

• Rail mounting: Yes (S7-1500 mounting rail)

Supply Voltage

• Load voltage L+: 24 V DC

• Permissible range: 19.2 28.8 V

• Reverse polarity protection: Yes

Input Current

• Without load: 75 mA max.

Encoder Supply

Per channel: one 5V and one 24V supply

• 5 V supply:

  • Voltage: 5.2 V 2%

  • Short-circuit protection: Yes

  • Output current: 300 mA max.

• 24 V supply:

  • Voltage: L+ (-0.8 V)

  • Short-circuit protection: Yes

  • Output current: 300 mA max.

Power

• From backplane bus: 1.3 W

• Power loss (typ.): 5.5 W

Address Area

• Inputs: 32 bytes (16 per channel, 4 bytes for fast mode)

• Outputs: 24 bytes (12 per channel, 4 bytes for Motion Control, 0 for fast mode)

Digital Inputs

• Inputs: 4 (2 per channel)

• Parameterizable: Yes

• IEC 61131 Type 3: Yes

Functions (parameterizable)

• Gate start/stop (for pulse/incremental)

• Capture

• Synchronization (for pulse/incremental)

• Freely usable DI

Input Voltage

• Type: DC

• Rated value: 24 V

• Signal "0": 5 +5 V

• Signal "1": +11 +30 V

• Permissible min: 30 V (brief), 5 V (continuous)

• Permissible max: +30 V

Input Current

• Signal "1": 2.5 mA typ.

Input Delay (parameterizable)

• Options: none / 0.05 / 0.1 / 0.4 / 0.8 / 1.6 / 3.2 / 12.8 / 20 ms

• 01 and 10 (min, with none): 6 s

Cable Length

• Shielded: 1000 m

• Unshielded: 600 m

Digital Outputs

• Type: Transistor

• Outputs: 4 (2 per channel)

• Parameterizable: Yes

• Short-circuit protection: Yes (electronic/thermal, 1 A threshold)

Switching Capacity

• Resistive load: 0.5 A

• Lamp load: 5 W

• Load resistance: 48 to 12 k

Output Voltage

• Type: DC

• Signal "1": min. 23.2 V

Output Current

• Rated: 0.5 A

• Permissible max: 0.6 A

• Minimum load: 2 mA

• Residual current (signal "0"): max. 0.5 mA

Output Delay

• 01: 50 s max

• 10: 50 s max

Switching Frequency

• Resistive: 10 kHz

• Inductive: 0.5 Hz

• Lamp: 10 Hz

Total Output Current

• Max per module: 2 A

Cable Length

• Shielded: 1000 m

• Unshielded: 600 m

Encoder Support

Incremental Encoder (RS-422)

• Input frequency: 1 MHz

• Counting frequency: 4 MHz (quadruple)

• Cable length (1 MHz): 32 m (shielded)

• A/B with 90 offset: Yes

• Zero track: Yes

Incremental Encoder (5V TTL/push-pull)

• Input frequency: 1 MHz

• Counting: 4 MHz

• Same functionality as RS-422

Absolute Encoder (SSI)

• Signal: RS-422

• Telegram length: 1040 bit

• Clock frequency: 125 kHz to 2 MHz

• Binary & Gray code: Yes

• Cable length depends on frequency (e.g., 320 m at 125 kHz)

• Parity bit: Yes

• Monoflop: 1664 s or automatic

• Multiturn / Singleturn supported

Interface Types

• TTL 5 V (push-pull)

• RS-422

Diagnostics / Status

• Diagnostic alarm: Yes

• Hardware interrupt: Yes

• Monitors: supply voltage, wire-break, short-circuit, A/B error, SSI telegram error

LED Indicators

• RUN (green)

• ERROR (red)

• MAINT (yellow)

• PWR (green)

• Channel status (green)

• Channel diagnostics (red)

Integrated Functions

• Counters: 2 (up to 4 MHz)

• Fast mode: Yes

• High-speed counter support: Yes

• Continuous counting

• Gates (HW/SW)

• Comparator: 2 per channel

• Incremental & absolute position detection

• Suitable for S7-1500 Motion Control

• Measuring functions with adjustable ranges

Accuracy

• Frequency measurement: 100 ppm

• Cycle duration: 100 ppm

• Velocity: 100 ppm

Potential Separation

• Between channels: No

• Channels Backplane bus: Yes

• Channels Load voltage L+: No

• Isolation test: 707 V DC

Ambient Conditions

• Operating temp (horizontal): 30 +60 C

• Operating temp (vertical): 30 +40 C

• Storage/transport: 40 +70 C

• Altitude: Up to 5000 m (restrictions >2000 m)

Compatibility

Works with:

• S7-300

• S7-400

• S7-1200

• S7-1500

• Standard PROFIBUS master

• Standard PROFINET controller

Dimensions & Weight

• Width: 35 mm

• Height: 147 mm

• Depth: 129 mm

• Weight: approx. 325 g 

Technical Details