SIEMENS 6ES7326-1BK02-0AB0
-
SIEMENS | PLC Controls | Digital Input / Output Modules
- EICHLER-art.no.: K0252220
- EAN: 4025515078234
- UPC: 040892550351
Product description
SIMATIC S7, DIGITAL INPUT SM 326, F-DI 24X24 V DC, FAIL-SAFE DIGITAL INPUT FOR SIMATIC S7 F-SYSTEMS WITH DIAGNOSTIC ALARM, UP TO CATEGORY 4 (EN 954-1)/ SIL3 (IEC61508)/PLE (ISO13849), 1X 40-POLE
Services for SIEMENS 6ES7326-1BK02-0AB0
Repair
from 636,68 €
to 1.146,02 €
Replacement
1.315,12 €
986,34 €
Used
1.461,24 €
1.095,93 €
New
1.623,60 €
1.217,70 €
SIEMENS |
6ES7326-1BK02-0AB0 –
additional product information
| Delivery information | |||
|---|---|---|---|
| Export identifier | AL: N ECCN: EAR99H | ||
| Net weight | 0.49 | ||
| Quantity | 1 Stück | ||
| Packaging quantity | 1 | ||
| Additional product information | |||
|---|---|---|---|
| Product status | EOP: 2025-10-01 | ||
| EAN | 4025515078234 | ||
| UPC | 040892550351 | ||
| Static lot number | 85389091 | ||
| List indicator | ST73 | ||
| Product group | 4465 | ||
| Country of origin | DE | ||
| Compliance with the substance restrictions according to RoHS directive | Since: 20091125 | ||
| Product classifications | Version | Classification | |
|---|---|---|---|
| eClass | 4 | 27-24-21-05 | |
| eClass | 5.1 | 27-24-22-04 | |
| eClass | 6.0 | 27-24-22-04 | |
| ETIM | 3 | / | |
| ETIM | 4 | EC001419 | |
| ETIM | 5 | EC001419 | |
What is 6ES7326-1BK02-0AB0 and where is it used?
6ES7326-1BK02-0AB0 is a fail-safe digital input module SM 326 for SIMATIC S7 F systems. The module processes 24 digital 24 V DC signals and is intended for applications where safety-related states must be detected reliably. With its diagnostic alarm, fail-safe functionality, and suitability for applications up to Category 4 / SIL 3 / PL e, the module is designed for safety-related signals such as emergency stop circuits, safety gate monitoring, enable signals, limit positions, and safety feedback signals from the field. For maintenance and purchasing teams, this part number is particularly relevant when an exact replacement is required within an existing S7 or ET 200M safety system.
Overview of the most important technical specifications and what they mean
The module operates on 24 V DC, provides 24 digital inputs, and requires a maximum of 450 mA from L+ and 100 mA from the 5 V backplane bus. It includes four electrically isolated sensor supply circuits, each rated at 400 mA nominal current. For signal detection, logic 0 is recognised between -30 V and +5 V, while logic 1 is recognised between +11 V and +30 V. The maximum input delay of 3.4 ms supports short response times in safety circuits. Permissible cable lengths are up to 200 m shielded and 100 m unshielded. With dimensions of 80 × 125 × 120 mm and a weight of approximately 442 g, the module fits standard ET 200M and S7-300 peripheral racks. For engineering and procurement, these are the key specifications affecting compatibility, wiring requirements, and diagnostic behaviour.
Product status, life-cycle status, and obsolescence
Siemens currently lists 6ES7326-1BK02-0AB0 as a spare part. The EICHLER product page additionally identifies the module with EOP: 2025-10-01. For operators of existing installations, this is a clear indication that spare-part availability should be managed proactively rather than only after a failure occurs. Siemens officially confirms that the older 6ES7326-1BK01-0AB0 was replaced by 6ES7326-1BK02-0AB0. For migration projects to newer platforms, Siemens references the ET 200SP HA F-DI 16x24VDC HA, 6DL1136-6BA00-0PH1 in a current comparison document. However, Siemens explicitly states that this comparison should not be interpreted as a guaranteed 1:1 replacement, and the technical documentation should always be reviewed in detail for the specific application.
Available EICHLER services and when they are relevant
For 6ES7326-1BK02-0AB0, EICHLER offers repair, exchange, used, and new units. Repair is particularly attractive when rapid restoration of system availability is required while retaining the existing hardware configuration. According to the product page, repair services include technical cleaning, preventive maintenance, comprehensive functional testing, and a minimum 24-month warranty. For urgent breakdown situations, exchange, used, or new units may be more suitable because of their shorter delivery times. From the perspective of maintenance, purchasing, and production management, this combination of services improves supply security: even at an advanced stage of the product life cycle, existing safety systems can continue to be supported without immediately requiring a complete retrofit project.
| Attribute | Value |
|---|---|
| Supply voltage | |
| Rated value (DC) | 24 V |
| Reverse polarity protection | Yes |
| Input current | |
| from load voltage L+ (without load), max. | 450 mA |
| from backplane bus 5 V DC, max. | 100 mA |
| Encoder supply | |
| Number of outputs | 4; Isolated |
| Output current | |
| ● Rated value | 400 mA |
| Power loss | |
| Power loss, typ. | 10 W |
| Digital inputs | |
| Number of digital inputs | 24 |
| Number of simultaneously controllable inputs | |
| all mounting positions | |
| — up to 40 °C, max. | 24 |
| — up to 60 °C, max. | 24; (at 24 V) or 18 (at 28.8 V) |
| Input voltage | |
| ● Type of input voltage | DC |
| ● Rated value (DC) | 24 V |
| ● for signal "0" | -30 to +5 V |
| ● for signal "1" | +11 to +30V |
| Input current | |
| ● for signal "0", max. (permissible quiescent current) | 2 mA |
| ● for signal "1", typ. | 10 mA |
| Input delay (for rated value of input voltage) | |
| for standard inputs | |
| — at "0" to "1", max. | 3.4 ms |
| — at "1" to "0", max. | 3.4 ms |
| Cable length | |
| ● shielded, max. | 200 m |
| ● unshielded, max. | 100 m |
| Encoder | |
| Connectable encoders | |
| ● 2-wire sensor | Yes; if short-circuit test is deactivated |
| — permissible quiescent current (2-wire sensor), max. | 2 mA |
| Interrupts/diagnostics/status information | |
| Diagnostics function | Yes |
| Alarms | |
| ● Diagnostic alarm | Yes |
| Diagnoses | |
| ● Diagnostic information readable | Yes |
| Diagnostics indication LED | |
| ● Fail-safe operation | Yes |
| ● Group error SF (red) | Yes |
| Potential separation | |
| Potential separation digital inputs | |
| ● between the channels | Yes |
| ● between the channels, in groups of | 12 |
| ● between the channels and backplane bus | Yes |
| Isolation | |
| Isolation tested with | 500 V DC/350 V AC |
| Standards, approvals, certificates | |
| Highest safety class achievable in safety mode | |
| ● acc. to DIN VDE 0801 | AK 6 |
| ● acc. to EN 954 | Cat. 4 |
| ● Performance level according to ISO 13849-1 | e |
| ● SIL acc. to IEC 61508 | SIL 3 |
| Connection method | |
| required front connector | 40-pin |
| Dimensions | |
| Width | 80 mm |
| Height | 125 mm |
| Depth | 120 mm |
| Weights | |
| Weight, approx. | 442 g |
| Fault description | Possible solution |
|---|---|
| Why does the 6ES7326-1BK02-0AB0 report a short circuit to L+ or an SF fault even though the contact is open? | When using the internal sensor supply, the module performs a short-circuit test. This means that a short circuit to L+ on an unwired sensor cable, cross-circuits between channels, or faults in the sensor supply can trigger a diagnostic message. First check whether the wiring is truly channel-separated, whether unintended bridges or shield/ground contacts are present, and whether the parameterisation matches the actual wiring. With an external sensor supply, certain faults are not detected by Siemens in the same way, so the supply must be checked separately. |
| Why do the inputs remain FALSE even though SAFE is green and no SF is present? | A common mistake is monitoring QBAD instead of the actual input signals. In the documented forum case, QBAD is explained as being FALSE during normal operation and only indicating passivated or faulty channels. The actual F-input bits must be monitored for testing. In addition, the channel must actually be used in the safety program, and the F-call must be active; otherwise, no usable online input signal will be visible. |
| Why does a safety fault appear immediately after replacing the module? | Before commissioning, the F-destination address of the replacement module must match the project configuration. Siemens documents that, for ET 200M F-modules, the PROFIsafe address is assigned via DIP switches. In SPS forum discussions, the correct setting of the F-address on the DIL switches is explicitly mentioned for a 1:1 module replacement. If the addressing and project do not match, the safety system reports a fault after the replacement. The module should only be released again after the address has been checked and the hardware configuration verified. |
| Why does message 2988:2074 appear when setting the IO address? | Siemens describes this message for fail-safe ET 200M modules when the relevant F-destination address has already been assigned to another module. Locate the module with the conflicting F_DEST_ADD and change the address of the second module. Afterwards, check and update the hardware configuration again so that no address conflict remains within the safety system. |
| Why does my 2-wire sensor not work reliably on the 6ES7326-1BK02-0AB0? | The module permits 2-wire sensors only when the short-circuit test is disabled. If the test remains active, the brief interruption of the sensor supply can distort the evaluation or generate unnecessary diagnostics. Therefore, check the sensor type, the parameterisation of the sensor supply, and the choice between internal and external supply. It is also advisable to compare the installation against the limits for signal 0, signal 1, and the permissible off-state leakage current. |
Is 6ES7326-1BK02-0AB0 still available or only available as a spare part?
Siemens lists the module as a spare part. For operators of existing installations, this is important because it clearly places the module in the service and spare-parts environment rather than in new automation projects. At the same time, EICHLER offers repair, exchange, used, and new units for this part number. This is particularly relevant for purchasing and maintenance departments seeking to minimise downtime and continue operating existing systems without an immediate retrofit.
Can the module also be used in standard operation?
Yes. Siemens explicitly states that the SM 326 DI 24 x DC 24V can be operated in standard mode (non-safety mode) and also supports Configuration in Run (CiR). Nevertheless, its primary role remains that of a fail-safe digital input module for safety applications. For existing installations, this is useful when a common hardware platform is intended to handle both standard and safety functions without requiring a different module type.
Is there an official 1:1 successor for migration projects?
An officially designated 1:1 successor for this module could not be identified in the available sources. Siemens does reference the ET 200SP HA F-DI 16x24VDC HA, 6DL1136-6BA00-0PH1, in a current migration comparison, but explicitly states that this comparison should not be interpreted as a guarantee of 1:1 compatibility. For migration projects, this is important because the newer platform may be technically suitable, but it does not automatically replace the existing module without engineering review and wiring verification.
Which sensors and cable lengths should be considered for the 6ES7326-1BK02-0AB0?
The module is designed for 24 V DC input signals. Siemens specifies -30 to +5 V for logic 0 and +11 to +30 V for logic 1. 2-wire sensors can be used, but only if the short-circuit test is disabled. Maximum cable lengths are 200 m shielded and 100 m unshielded. These values are particularly important when long cable runs are involved, existing sensor systems are being retained, or intermittent diagnostic issues already exist within the installation.
What should I pay particular attention to during a 1:1 module replacement?
The most important point is the F-address (F_DEST_ADD). Siemens documents address assignment on ET 200M F-modules via DIP switches, and SPS forum discussions specifically identify this as the critical factor when replacing the 6ES7326-1BK02-0AB0. Before powering up the replacement module, verify that the replacement unit, DIP switch settings, and project configuration match exactly. Only then should the hardware check, commissioning approval, and functional test be performed. Following this procedure significantly reduces the risk of an immediate safety fault after replacement.
How quickly does the module respond to input signals?
For standard inputs, Siemens specifies a maximum input delay of 3.4 ms for both 0-to-1 and 1-to-0 transitions. For safety calculations, Siemens additionally references, in a current compendium, an example value of 32 ms, consisting of internal processing time, input delay, and short-circuit test time for the 6ES7326-1BK02-0AB0. This information is particularly useful when reaction times must be evaluated and documented for safety functions, diagnostic chains, or acceptance testing.
