How-To Guide  ·  Siemens ET 200SP  ·  Digital Input Configuration

6ES7131-6BH01-0BA0: Installation, Wiring, TIA Portal Configuration, and Diagnostics Guide

ET 200SP Platform  ·  DI 16x24VDC ST  ·  Sink Input (P-Reading)  ·  TIA Portal / STEP 7

1. Module Overview

The 6ES7131-6BH01-0BA0 is a 16-point sink digital input module for the ET 200SP platform. It reads 24VDC discrete signals using P-reading (sink/PNP) inputs and maps them into 2 bytes of input data (1 bit per channel). The module supports per-channel input delay selection from 0.05 to 20 ms, per-module diagnostics for wire break and supply voltage loss, and is suitable for connection of switches and 2-wire sensors per IEC 61131, type 3. The module color code is CC00 and requires BaseUnit type A0 with mechanical coding element Type A.

The module has hardware functional status from FS02, firmware version V0.0 (no firmware update possible), and supports I&M data I&M0 to I&M3. It does not support isochronous mode, counter mode, oversampling, or MSI mode. It is suitable for operation on PROFINET R1 interface modules. The module is not suitable for safety functions.

Catalog Number Breakdown

A 10-unit package variant is also available: 6ES7131-6BH01-2BA0 (identical module, sold in package unit of 10 units).

Key Specifications

Version Dependencies

The following table shows the version dependencies for key functions, taken directly from the module manual (Table 2-1, page 12).

Engineering Software Compatibility

2. Hardware Installation

The ET 200SP system uses 35 mm DIN rail mounting. The station is assembled left to right: interface module first, then BaseUnits with I/O modules snapped in, and terminated with a server module at the right end. Each I/O module mounts into a BaseUnit — the BaseUnit provides the backplane connection, terminal wiring points, and field power distribution via the self-assembling P1, P2, and AUX voltage buses. Per the module manual (section 3.1): the load group of the module must begin with a light-colored BaseUnit, and only digital modules with BaseUnit type A0 should be used during commissioning.

System Assembly Order

Installation Steps

1. Mount the IM 155-6 PN interface module on a 35 mm DIN rail. Snap the interface module onto the rail until the locking clip engages. The interface module provides the PROFINET connection to the S7-1500 or S7-1200 controller and distributes backplane power to all I/O modules in the station.
2. Mount a light-colored BaseUnit (BU type A0) to the right of the interface module. The light-colored BaseUnit starts a new potential group. It interrupts the three self-assembling voltage buses (P1, P2, AUX) from the left neighbor, so L+ and M must be wired at this BaseUnit. The BaseUnit includes a 2.5 A fuse for the L+ supply (per manual Figure 3-1). Slide it onto the rail and press until it clicks.
3. Install the mechanical coding element (Type A) into the BaseUnit. The DI 16x24VDC ST requires mechanical coding element Type A (per datasheet p.2). This prevents incorrect module insertion — only modules with a matching coding key can be plugged in.
4. Snap the DI 16x24VDC ST module into the BaseUnit. Align the module with the BaseUnit guides and press firmly until it clicks into place. The module engages the backplane connector automatically.
5. Attach the color identification label. The module uses color code CC00. Insert the corresponding color-coded label into the label slot on the module front (per manual Figure 2-1, callout 8). Labeling strips, color identification labels, and reference identification labels must be ordered separately (manual §2.1).
6. Mount additional BaseUnits for subsequent I/O modules. Use dark-colored BaseUnits for modules that should share the same field power potential group as the first BaseUnit. A dark-colored BaseUnit takes the potential of the self-assembling voltage buses P1, P2, and AUX from the left neighbor. Use a new light-colored BaseUnit to start a new potential group with independent L+ and M supply.
7. Terminate the station with a server module. The server module (6ES7193-6PA00-0AA0) must be installed at the rightmost position. It terminates the ET 200SP backplane bus. The station will not operate without it.

3. Wiring

Terminal Assignments — BU Type A0, 1-Wire Connection

The DI 16x24VDC ST module uses a BU type A0 BaseUnit with 16 input terminals arranged in two columns (left and right). This is a 1-wire connection — each field signal connects to a single terminal on the BaseUnit. Per the manual’s block diagram (Figure 3-1, page 14): even-numbered channels (CH0, CH2, CH4, CH6, CH8, CH10, CH12, CH14) connect on the left column at pins 1, 3, 5, 7, 9, 11, 13, 15, and odd-numbered channels (CH1, CH3, CH5, CH7, CH9, CH11, CH13, CH15) connect on the right column at pins 2, 4, 6, 8, 10, 12, 14, 16. Field power (L+ and M) is supplied to the dedicated supply terminals on the light-colored BaseUnit and distributed via the backplane to dark-colored neighbors.

The BaseUnit also provides dedicated terminals for L+ (24 V DC supply, fused at 2.5 A on the light-colored BaseUnit per manual Figure 3-1) and M (ground return). These are separate from the 16 signal input pins. The light-colored BaseUnit feeds L+ and M to the module via filter connection supply voltage terminals. The block diagram (manual Figure 3-1) shows the filter connection (callout 5) operates only when a light-colored BaseUnit is present.

Connection Variants

The DI 16x24VDC ST supports multiple connection variants depending on the BaseUnit configuration. Per the manual’s technical specifications (section 6.1, page 25):

Sink (P-Reading) Wiring

P-reading (sink) inputs require the field device to switch the positive voltage to the input terminal. When the field device closes, current flows from L+ (24 V DC) through the device and into the module input. The return path is through M (ground) on the BaseUnit backplane. The typical input current for signal “1” is 2.5 mA (per datasheet page 2).

Typical Field Device Wiring Examples

4. TIA Portal Configuration

The 6ES7131-6BH01-0BA0 is configured in Siemens STEP 7 (TIA Portal) V14 or higher with HSP 0222 for PROFINET IO, or STEP 7 V5.5 SP3 or higher with HSP 0229 V7.0 for PROFIBUS DP. The module can also be configured with PCS 7 V8.1 SP1 or higher, or PCS neo from V1.0.0 (per datasheet page 1). Three configurations are possible per the manual (section 4.1): central operation with an ET 200SP CPU, distributed operation on PROFINET IO, or distributed operation with PROFIBUS DP.

Adding the Module in TIA Portal

1. In TIA Portal, open your project and navigate to Devices & Networks → double-click your ET 200SP station to open Device Configuration.
2. In the device view, the station rack shows the interface module and any existing modules. Click an empty slot to the right of the last module.
3. In the Hardware Catalog panel on the right, expand DI → locate DI 16x24VDC ST (order number 6ES7131-6BH01-0BA0) and drag it onto the empty slot, or double-click to add it.
4. The module appears in the slot. TIA Portal automatically assigns input addresses (default: process image of inputs, 2 bytes).
5. Click the module to select it, then open the Properties panel below to configure parameters.

Configuration Options (GSD File)

The module can be configured in two ways via the GSD file. Per the manual (Table 4-2, section 4.3, page 19):

Module Parameters

All parameters are set per-module or per-channel in the Properties → Module Parameters tab. The following table lists all configurable parameters with their options and defaults, taken directly from the module manual (Table 4-1, pages 16–17).

¹ Per manual footnote 2 (page 17): with a PROFIBUS GSD configuration, input delay is a module-level parameter (applies to all channels equally) due to the limited parameter length of 4 bytes. The per-channel setting can be used via data record 128 if needed (see Appendix A).

Address Space

The module occupies 2 bytes of input address space in the process image input (PII), optionally extended to 4 bytes when value status (Quality Information / QI) is enabled. Per manual section 4.3 and Figure 4-1 (page 20):

The starting address a is automatically assigned by TIA Portal based on slot position. You can manually override it in the module Properties → I/O Addresses tab. In the S7-1500 process image, inputs are accessed as I a.x (e.g., I 0.0 for channel 0 if the base address is 0).

Evaluating Value Status (QI)

Per manual section 4.3 (page 19): when value status (QI) is enabled, an additional 2 bytes are allocated in the input address space. Bits 0 to 15 in these bytes are assigned to channels 0 to 15 and provide information about the validity of the digital value:

If a fault occurs on a channel with this module, the value status for all channels is set to 0. Value status with QI is available only via PROFINET IO GSD — it is not supported with PROFIBUS DP GSD (per manual Table 4-2).

Input Delay Recommendations

5. Diagnostics & Troubleshooting

LED Indicators

The 6ES7131-6BH01-0BA0 has three types of LEDs per manual section 5.1 and Figure 5-1 (page 21): one DIAG LED (green/red) for module diagnostics at the top of the module, 16 channel status LEDs (green, labeled .0 through .15) in the lower section, and one PWR LED (green) for supply voltage status at the bottom.

DIAG LED (green/red) — Manual Table 5-1

Channel Status LEDs (.0 – .15) — green — Manual Table 5-2

PWR LED (green) — Manual Table 5-3

Diagnostic Interrupts — Manual Section 5.2

The DI 16x24VDC ST digital input module supports diagnostic interrupts. Per the manual (section 5.2, page 23), a diagnostics alarm is generated and the DIAG LED flashes on the module for each diagnostics event. The module generates a diagnostic interrupt for the following events:

• Wire break
• Parameter assignment error
• Supply voltage missing

You can read out the diagnostics alarms in the diagnostics buffer of the CPU and evaluate the error codes with the user program.

Diagnostic Alarms and Error Codes — Manual Table 5-4

Common Faults and Resolutions

6. Related ET 200SP Modules

The ET 200SP platform includes several digital input module variants to match different channel counts and feature requirements:

7. Related Guides

Reference Documentation

The following Siemens publications were used as the primary data sources for this guide. All technical specifications, terminal assignments, parameter tables, LED states, and diagnostic codes were extracted directly from these manufacturer documents.