INTERFACE MODULES 6ES7153-2AA02-0XB0 6ES7153-2AA02-0XB0 6ES7153-2AA02-0XB0

Siemens 6ES7153-2AA02-0XB0 | SIMATIC ET 200M IM 153-2 Interface Module — PROFIBUS DP 12 Mbit/s, Up to 8 S7-300 Modules, Redundancy, 10ms Time Stamping, 24VDC

Overview

The Siemens 6ES7153-2AA02-0XB0 is the IM 153-2 — the interface module that defines every ET 200M distributed I/O station.

Without it, an ET 200M rack is just a collection of I/O modules with nowhere to connect; with it, the rack becomes a fully functional PROFIBUS DP slave, actively exchanging process data with the central S7 controller across distances up to the PROFIBUS cable length limit at the configured data rate.

The ET 200M system was designed for situations where a centrally controlled machine or process has I/O points scattered across a wide physical area — too far apart to wire economically to a central rack, but close enough in groups to benefit from a shared local enclosure.

Each ET 200M station handles one physical cluster of I/O points: it connects to the sensors and actuators nearby, processes their signals through the S7-300-compatible signal modules in its rack, and exchanges the resulting process data with the controller over a single PROFIBUS DP cable.

he IM 153-2 is the module that manages this exchange — setting up the PROFIBUS DP slave protocol, synchronising data transfer with the DP master's polling cycle, and handling the diagnostic reporting that tells the controller the status of each module in the rack.

The 6ES7153-2AA02-0XB0 variant supports up to eight signal modules per ET 200M station.

This is the standard capacity for most ET 200M applications — enough to accommodate a combination of digital input, digital output, analog input, and analog output modules covering a complete I/O cluster without requiring a second station.

Its 128-byte input / 128-byte output addressing volume scales naturally with eight-module configurations at typical module widths.

Key Specifications

Redundancy — How the IM 153-2 Handles Fault Switchover

One of the IM 153-2's capabilities that separates it from simpler interface modules is redundancy support.

In a redundant ET 200M configuration, two IM 153-2 modules are installed in the same ET 200M rack — one active and one in standby.

Both connect to the same PROFIBUS DP cable (or to two separate DP cables in a redundant bus configuration), but only the active module handles cyclic data exchange at any given time.

If the active IM 153-2 fails — due to internal hardware failure, power supply interruption, or loss of PROFIBUS communication on its cable — the standby module detects the failure through its continuous monitoring of the active module's status and switches to active mode.

This switchover takes place without loss of process data and within the tolerances defined by the DP master's watchdog timer.

The I/O modules in the rack continue operating through the transition; the new active IM 153-2 immediately resumes cyclic data exchange with the PROFIBUS DP master.

For process plants and critical machinery where an I/O station failure means plant shutdown, the dual IM 153-2 configuration is often a standard requirement in the system design specification.

The cost of two IM 153-2 modules is small compared to the cost of an unplanned production stop caused by a single point of failure in the I/O infrastructure.

Time Stamping — Event Recording with 10ms Resolution

The IM 153-2's time stamping function records the exact time of digital input state changes — rising edges and falling edges — to within 10ms accuracy.

This is separate from the normal cyclic process data exchange: the module maintains an internal event buffer (15 buffers, up to 20 messages each) that stores timestamped events, which the DP master reads acyclically. The time reference uses RFC 1119 Internet time format, synchronised to the SIMATIC controller's clock.

Time stamping serves several engineering purposes.

In safety-critical event analysis — determining which input changed first after a process upset, or reconstructing the sequence of events leading to a machine stop — millisecond-resolution timestamps provide the factual basis that raw cyclic scan data (which only tells you the state at the end of each scan) cannot.

Process disturbance analysis, energy monitoring event logs, and batch start/stop time recording are other applications where the time stamping function captures data that the control program alone cannot produce.

Up to 128 digital inputs across the ET 200M station can be stamped simultaneously, with rising and falling edge events transmitted on a 1000ms reporting cycle.

This function is available with the standard 8-module configuration of the 6ES7153-2AA02-0XB0.

PROFIBUS Services — SYNC, FREEZE, and Direct Data Exchange

Beyond basic master-slave cyclic I/O, the IM 153-2 supports three PROFIBUS DP extended services that provide additional synchronisation and communication capabilities:

SYNC forces all output modules in the ET 200M station to update their outputs simultaneously on a SYNC command from the DP master, regardless of when the individual output data arrived over the bus.

This is used in machine applications where multiple output channels must switch at exactly the same moment — simultaneous activation of several axes or valve groups in a coordinated sequence.

FREEZE locks all input modules in the ET 200M station to capture their input states simultaneously at a FREEZE command from the master.

The locked state is held until the master reads the frozen data and releases the lock.

For measuring the state of multiple input channels at a defined instant — position sensors on multiple axes, or the state of a production line at a specific event — FREEZE provides the temporal synchronisation that normal cyclic reading cannot guarantee.

Direct data exchange (slave-to-slave) allows one ET 200M slave to publish its input data directly to another DP slave's address space without the DP master routing the data. This enables sensor-to-actuator data paths with minimum latency that bypass the master's program cycle, useful in fast-response machine interlocks and safety-critical local control loops.

FAQ

Q1: The module supports up to 8 S7-300 modules. Can function modules (FM) and communication processors (CP) be used in addition to signal modules?

Yes. The eight module slots in an ET 200M station can hold any combination of S7-300 signal modules (SM), function modules (FM), and communication processors (CP) that are released for use in the ET 200M.

Function modules such as FM 350-1/350-2 (high-speed counting) and FM 352 (cam controller) operate in ET 200M with the same parameterisation as in a central S7-300 rack.

The total module count — SM + FM + CP combined — must not exceed eight per IM 153-2 (6ES7153-2AA02-0XB0) station.

Q2: What is the PROFIBUS address range for the IM 153-2, and how is it set?

The PROFIBUS address is set via a two-row DIL switch block on the front of the IM 153-2 module, encoding the address in binary.

Valid addresses are 1 to 125 (addresses 0 and 126 are reserved; 127 is for diagnostic broadcasts).

The address takes effect immediately at power-up — there is no need to cycle power after changing the switch.

The address set on the module must match the address assigned to this DP slave in the S7 master's hardware configuration (STEP 7 HW Config or TIA Portal equivalent).

Q3: Does the 6ES7153-2AA02-0XB0 support removal and insertion under power (hot swapping) of its I/O modules?

The IM 153-2 supports module replacement under power for signal modules in the ET 200M rack, provided the specific signal modules used are released for this function.

When a signal module is removed during operation, the IM 153-2 reports the slot as empty to the DP master, and the DP master's program handles the missing module according to its configured diagnostic reaction.

When a replacement module is inserted, the IM 153-2 recognises it and resumes data exchange for that slot. Not all S7-300 modules support hot swap — the module documentation must be checked for each specific type before relying on this function in a live installation.

Q4: The module is listed as supporting ATEX classification Cl.I Div.2 / II 3G EEx nA II T4. What does this mean for use in potentially explosive atmospheres?

The ATEX approval means the 6ES7153-2AA02-0XB0 may be installed in Zone 2 hazardous areas (gas atmospheres) and Class I Division 2 areas (North American equivalent). Zone 2 / Div.2 classification applies where flammable gas is not normally present but may occur in abnormal conditions.

The EEx nA classification indicates the module is non-sparking under normal operation and does not contain sparking contacts that could ignite the hazardous atmosphere.

This approval allows the ET 200M station to be installed closer to hazardous process equipment without requiring purged or pressurised enclosures, subject to the installation conditions specified in the KEMA certificate.

Q5: Can the IM 153-2 (6ES7153-2AA02-0XB0) also be used as an interface module in a DP/PA Link or Y-Link?

No. The 6ES7153-2AA02-0XB0 (IM 153-2AA variant) is designed exclusively for direct ET 200M station use. The IM 153-2BA variants (e.g., 6ES7153-2BA02-0XB0, 6ES7153-2BA10-0XB0) are the modules certified for use as interface modules in DP/PA Link and Y-Link architectures, as well as supporting up to 12 signal modules per station (versus 8 for this variant).

When selecting an IM 153-2 for DP/PA Link or Y-Link integration, the -2BA series must be specified.