Features:
- Twenty-four inputs can be used singly or as twelve evaluated pairs.
- Four protected sensor supplies feed the channel groups.
- Channel, SF, and SAFE indicators separate input state from module and safety conditions.
Siemens 6ES7326-1BK01-0AB0 reads safety or standard 24 V DC sensor states for an S7-300 station.
Its channel pairing changes the relationship between field contacts and process-image bits.
Module diagnostics report field-supply, discrepancy, communication, and internal errors through the controller.
The 6ES7326-1BK01-0AB0 article is the 24-input SM 326 revision; later BK02 hardware is a different order number and is not used as the product identity here.
Siemens 6ES7326-1BK01-0AB0 SIMATIC S7-300 SM 326 24-Channel Fail-Safe Digital Input Module Manuals,Datasheets,Link
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
Channel and Address Organization
- Single-channel: All 24 inputs can be evaluated independently.
- Dual-channel: Paired channels provide twelve 1oo2 process signals.
- Isolation: The inputs are separated into two isolated groups of twelve.
- Addressing: The module occupies 10 input bytes and 4 output bytes.
Internal and External Sensor Power
- Outputs: Four protected supplies feed six-channel groups.
- Grouping: Sensor-supply outputs are isolated in pairs.
- External source: All six channels in a group must use the same external supply.
- Detection limit: External supply wiring removes some internal short-circuit detection coverage.
Sensor Evaluation and Timing
- 1oo1: A single input produces the process signal for its channel.
- 1oo2: Two paired inputs are compared before one process signal is released.
- Discrepancy: The configured time must allow both contacts to change without a false fault.
- Safety level: The application wiring and sensor quality determine whether SIL 3 / Category 4 is achieved.
Fault Indication and Recovery
- Channel faults: Sensor-line and discrepancy conditions are assigned to the affected channel.
- Module faults: Missing auxiliary voltage and communication faults affect the module.
- Indicators: SF, SAFE, and channel LEDs provide local state information.
- Corrective path: Controller diagnostics identify whether wiring, parameters, communication, or hardware requires attention.