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PRODUCT DESCRIPTION
Two-channel pulse counting for S7-1500 automation
Siemens 6ES7550-1AA01-0AB0 is the TM Count 2x24V technology module for SIMATIC S7-1500 and ET 200MP. Its two 32-bit channels acquire 24 V incremental or pulse-encoder signals and provide three digital inputs and two digital outputs per channel.
The module supports gated counting, capture, frequency and velocity measurement, and switching at comparison values. Firmware V2.0 also provides Fast Mode with reduced functionality; match the operating mode, encoder circuit, supply budget and STEP 7 configuration to the machine.
The module supports gated counting, capture, frequency and velocity measurement, and switching at comparison values. Firmware V2.0 also provides Fast Mode with reduced functionality; match the operating mode, encoder circuit, supply budget and STEP 7 configuration to the machine.
BEFORE YOU BUY
Confirm the counting configuration
ACTUAL APPLICATIONS
Where 6ES7550-1AA01-0AB0 supports counting tasks
These scenarios follow functions documented in the Siemens equipment manual. Their implementation requires an engineered encoder connection, validated program and correctly rated output circuit.
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01 · EVENT ACQUISITION
Counting within a defined process window
Use the hardware and software gates to restrict pulse acquisition to a selected machine interval. The controller can evaluate the resulting count while excluding events outside the enabled window. -
02 · MOTION MEASUREMENT
Calculating pulse-based velocity
The module calculates frequency, period or velocity from encoder signals. Configure the measurement interval and scaling so the reported value represents the motion being monitored. -
03 · LOCAL SWITCHING
Actuating at comparison conditions
Two configurable comparison values per channel can switch the digital outputs directly when count or measured values meet the selected conditions. Match output loads and hysteresis to the required process response.
Technical specifications for 6ES7550-1AA01-0AB0
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Product Model6ES7550-1AA01-0AB0
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Product ParametersTwo-Channel 24V Counter Module
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In stock1 unit
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ManufacturerSiemens
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Counting channels2 channels; 32-bit counter range
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Encoder signal classes24 V sourcing, sinking or push-pull A/B/N signals
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Encoder frequency200 kHz input; 800 kHz count with quadruple evaluation
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Load supply L+24 V DC; permissible range 19.2 to 28.8 V DC
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Encoder supply outputCommon 24 V supply; maximum 1 A total across both channels
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Digital inputs6 configurable inputs; 3 per channel; IEC 61131 Type 3
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Digital outputs4 sourcing transistor outputs; 0.5 A each, 2 A total
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Process address spaceStandard module interface: 32 input bytes, 24 output bytes
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Backplane power1.3 W; typical module power loss 4 W
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Operating temperatureHorizontal -30 to 60 °C; vertical -30 to 40 °C; inductive-load derating applies
View all additional
Alternative Names
6ES7550-1AA01-0AB0
TM Count 2x24V
SIMATIC S7-1500 Counter Module
SYSTEM & REPLACEMENT CHECK
Information needed before ordering
Three direct checks to secure your system integration and minimize ordering risks.
Information
System integration
Replacement check
Manuals & support
SIMATIC S7-1500 COUNTING ARCHITECTURE
Coordinate gates, encoder signals and comparison outputs
Siemens 6ES7550-1AA01-0AB0 integrates two 24 V counter channels into an S7-1500 or supported ET 200MP station. Match sourcing, sinking or push-pull A/B/N signals to the configured encoder type.
Each channel has three digital inputs for functions such as gate, synchronization and capture, plus two sourcing digital outputs. The common encoder supply is limited to 1 A total; output loads must meet the separate current and derating limits.
Select counting, measuring, Motion Control or Fast Mode deliberately. Firmware V2.0 Fast Mode is documented with STEP 7 V16 and HSP0332; it provides reduced feedback and no normal control interface.
Features:
- Exact Siemens order code: 6ES7550-1AA01-0AB0
- TM Count 2x24V with two 32-bit channels
- Check encoder circuit, gate logic and DQ loading
The Siemens 6ES7550-1AA01-0AB0 TM Count 2x24V requires encoder, power, operating-mode and gate settings to be validated before system integration and commissioning.
INTERCHANGEABILITY
Verify the complete replacement identity before commissioning
The Siemens equipment manual identifies 6ES7550-1AA01-0AB0 with firmware V2.0 as a compatible replacement for 6ES7550-1AA00-0AB0. Retain the requested complete order number and confirm the installed engineering configuration before exchanging hardware.
Back up counter settings, gate sources, capture frequency, comparison values and channel direction. Record the shared encoder-supply load and the current of each output circuit before transferring the front connector.
Newer functionality such as Fast Mode depends on firmware and project support. Verify the selected process interface, input filters and actual count/output behavior after replacement rather than assuming the previous program uses every V2.0 feature.
Features:
- Match the complete 6ES7550-1AA01-0AB0 order code
- Preserve gate, capture and comparison settings
- Confirm firmware and process-interface compatibility
The Siemens 6ES7550-1AA01-0AB0 TM Count 2x24V requires replacement verification of channel configuration, encoder power, load limits and measured counter behavior before commissioning.
DOCUMENTATION STATUS
Browse the Manuals, Datasheets, Official Documents, Links
Important Notice: The linked Amikon documents identify their Siemens sources. Accessories, manuals, cables, calibration data, software, certificates and other items are not included unless listed in the stock item description.
Features:
- Available Siemens document references are confirmed before order
- Software licensing and project backups remain the customer's responsibility
- Accessories are supplied only when listed in the quotation
Documentation for the Siemens 6ES7550-1AA01-0AB0 TM Count 2x24V must match the complete order number, firmware and selected counter mode; confirm manual availability in the written quotation.
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Important notice
Manuals, software, firmware, cables, calibration data and accessories are included only when listed in the quotation. AMIKON is an independent supplier and is not affiliated with or authorised by the manufacturer.
This content has been produced using multiple sources. Takes no responsibility for the accuracy of this information. Always consult the original equipment manufacturer for the most up to date instructions and information.
BUYER INFORMATION
Commercial terms without hidden steps
Your written quote confirms the product identity, price, availability, lead time, warranty and shipping terms before payment.
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Shipping & delivery
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DispatchEligible stock: same / next day
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CarriersDHL, FedEx or UPS
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Ship fromXiamen, China
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Packed size16.1 × 19.4 × 4.7 cm
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Shipping weightApprox. 0.25 kg
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Payment & customs
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PaymentBank transfer (T/T)
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CurrenciesUSD · EUR · GBP · RMB
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Credit cardsNot accepted
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HS reference8538900000
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OriginGermany
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Warranty & returns
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Warranty12 months from AMIKON
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InspectionLabel, condition and packing checks
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ReturnsPrior RMA authorisation required
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CompatibilityConfirm before order
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OEM warrantyDoes not apply
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Your written quote confirms the product identity, price, availability, lead time, warranty and shipping terms before payment.
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Part checked
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Sandy Lin
Dedicated account manager · 15+ years
FREQUENTLY ASKED QUESTIONS
Questions buyers ask about 6ES7550-1AA01-0AB0
Direct answers about identity, compatibility, stock, warranty, payment and shipping.
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How can a batch counter ignore pulses outside its measuring window?
Configure hardware and software gate control to define when count signals are acquired. Check the selected gate behavior and starting value in the project, then test pulses before, during and after the intended window. -
Does the Capture function have to overwrite its saved value at every edge?
No. The Frequency of Capture function parameter selects capture at each configured edge or once after each enable. A digital-input edge or rising N signal can latch the count; choose the behavior required by the machine sequence. -
Why is wire-break monitoring unavailable with a sinking sensor?
The manual supports sourcing, sinking and push-pull 24 V encoders, but specifies wire-break monitoring for push-pull signals. Select the actual encoder output circuit rather than enabling a diagnostic that the wiring cannot support. -
What prevents a comparison output from chattering around a count threshold?
Configure hysteresis for the comparison values. The resulting band prevents repeated output switching when small encoder movements make the count fluctuate near a switching point. -
Is the encoder supply rated at 1 A for each counter channel?
No. A single 24 V encoder supply is shared by both channels, with a maximum total current of 1 A for all connected encoders and sensors. Add their loads together when checking the available supply budget. -
Why does Fast Mode remove the normal control interface?
Fast Mode deliberately reduces functionality to acquire counter values with a shorter CPU send clock. It provides a reduced feedback interface and no control interface; applications requiring the normal control commands must use an appropriate operating mode. -
Can counter limits and the start value be changed while a machine is running?
The manual permits runtime changes through the user program. Define the response at each counting limit and keep the start value within the configured range; validate transitions so a changed limit cannot produce an unintended output action. -
When are shielded cables mandatory for the auxiliary digital inputs?
Siemens requires shielded cables when digital-input delay is set to None or 0.05 ms. Do not apply a fast filter setting while retaining wiring intended only for slower input processing.
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