Siemens 6ES7322-1BF01-0AA0 SM322 8DO 24V DC Module

6ES7322-1BF01-0AA0 SIMATIC S7-300 SM 322 Digital Output Module

Product Introduction

The Siemens 6ES7322-1BF01-0AA0 is a robust digital output module from the SIMATIC S7-300 family. This SM 322 module features 8 optically isolated outputs, each rated at 24 V DC with a 2 A switching capacity. It offers excellent protection against electrical interference, making it suitable for demanding factory automation tasks.

This output module connects directly to the S7-300 backplane bus. It requires a 20-pin front connector (not included). The module is compact, with a width of only 40 mm, saving valuable space in your control cabinet. Its design ensures reliable operation across a wide temperature range.

Technical Specifications

The 6ES7322-1BF01-0AA0 operates with a load voltage L+ rated at 24 V DC. The permissible voltage range spans from 20.4 V to 28.8 V, accommodating typical power supply variations.

Power and Current Details

From the load voltage L+, the module draws a maximum of 60 mA without any load connected. Additionally, it consumes up to 40 mA from the 5 V DC backplane bus. Its typical power loss is 6.8 W, which should be considered for thermal management within your enclosure.

Digital Output Characteristics

This SM 322 provides 8 digital outputs, each capable of driving a load resistance between 12 Ω and 4 kΩ. For a signal "1", the output voltage meets at least L+ minus 0.8 V. The rated output current is 2 A, with a minimum load current requirement of 5 mA. Conversely, the residual current for a signal "0" remains below 0.5 mA.

Switching Frequencies and Total Current

Switching frequency depends on the load type. For resistive loads, the maximum is 100 Hz. With inductive loads, the frequency drops to 0.5 Hz, while lamp loads allow up to 10 Hz. The total current per group is 4 A, regardless of installation orientation (horizontal or vertical) and ambient temperature up to 60 °C.

Cable Length and Isolation

For output wiring, shielded cables can extend up to 1,000 meters, while unshielded cables are limited to 600 meters. The module provides excellent potential separation. Outputs are isolated from each other in groups of 4, and they are also isolated from the backplane bus using optocouplers. The isolation test voltage is 500 V DC, and the permissible potential difference between different circuits is 75 V DC or 60 V AC.

Diagnostics and Status Indication

Notably, this 6ES7322-1BF01-0AA0 does not support diagnostic functions. There are no alarms for wire-break, short-circuit, fuse blow, or missing load voltage. The only indication LEDs are green status indicators for each digital output channel, showing the active state of each output.

Mechanical and Environmental Data

Physically, the SM 322 measures 40 mm in width, 125 mm in height, and 120 mm in depth. It weighs approximately 190 g, making it lightweight and easy to handle. The module operates reliably within an ambient temperature range of 0 °C to 60 °C.

Installation Guidelines

Installing the 6ES7322-1BF01-0AA0 is a straightforward process. First, turn off the power supply to your S7-300 rack. Mount the module onto the DIN rail by snapping it into place. Secure it with the mounting screws provided. Next, connect the 20-pin front connector, ensuring all wiring matches your application requirements. Pay attention to the polarity of the load voltage L+ (24 V DC). Finally, configure the module in your STEP 7 hardware configuration and download the updated project.

Packaging List

• Siemens 6ES7322-1BF01-0AA0 SM 322 digital output module (1 unit)

• Labeling strips (1 set)

• Manual (1 copy)

Shipping Method: FedEx, UPS, DHL

Frequently Asked Questions (FAQ)

1. Does the 6ES7322-1BF01-0AA0 include a front connector?
No, the 20-pin front connector is not included with this SM 322 module. You must order it separately.

2. Can I connect inductive loads directly to this output module?
Yes, but the switching frequency for inductive loads is limited to 0.5 Hz. Additionally, we recommend using a freewheeling diode to protect the output.

3. What is the total current capacity per group for this Siemens SM 322?
Each group can handle a maximum total current of 4 A across all outputs in that group, even at 60 °C.

4. Does this module provide short-circuit protection?
No, the 6ES7322-1BF01-0AA0 does not include diagnostic or protection features like short-circuit detection. External fusing is advisable.

5. What is the maximum cable length for the outputs?
For shielded cables, the maximum length is 1,000 meters. For unshielded cables, it is 600 meters.