Siemens 6ES7322-1HF01-0AA0 SM322 Relay Output Module

6ES7322-1HF01-0AA0 SIMATIC S7-300 SM 322 Relay Output Module

Product Introduction

The Siemens 6ES7322-1HF01-0AA0 is a highly flexible digital output module from the SIMATIC S7-300 family. This SM 322 module features 8 relay outputs, each capable of switching 2 A. Unlike solid-state outputs, these relays support both 24 V DC and 230 V AC loads, making them suitable for a wide range of industrial applications.

This module is optically isolated, providing excellent protection against electrical interference. It connects via a standard 20-pin front connector. The relay design allows for mechanical switching, which is ideal for applications requiring galvanic isolation or where different voltage levels must be controlled.

Technical Specifications

The 6ES7322-1HF01-0AA0 requires a load voltage L+ rated at 24 V DC for the relay coils. The input current from the supply voltage L+ reaches a maximum of 160 mA. Additionally, it draws up to 40 mA from the 5 V DC backplane bus. Its typical power loss is only 3.2 W, which is relatively low for a relay-based module.

Relay Output Characteristics

This SM 322 provides 8 digital outputs using electromechanical relays. Each relay can switch a rated current of 2 A. The minimum load current required for reliable operation is 5 mA. For lamp loads, the switching capacity reaches up to 50 W.

The switching frequency depends on the load type. For resistive loads, the maximum is 2 Hz. With inductive loads, the frequency drops to 0.5 Hz, while lamp loads also allow up to 2 Hz. The mechanical switching frequency, without load, reaches 10 Hz.

Relay Durability and Contact Ratings

Relay longevity varies with the load voltage and current. At 230 V AC and 2 A, the module supports 100,000 operating cycles. At 120 V AC, this increases to 200,000 cycles. For 24 V DC at 2 A, the relay life extends to 300,000 cycles.

The switching capacity for both inductive and resistive loads is 2 A. The relay coil requires a rated supply voltage of 24 V DC, drawing 110 mA. This information is crucial for designing your power budget.

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 robust potential separation. Outputs are isolated from each other in groups of 2, and they are also isolated from the backplane bus using optocouplers. The isolation test voltage is 1500 V AC, offering superior protection.

Diagnostics and Status Indication

This 6ES7322-1HF01-0AA0 does not support diagnostic functions. There are no alarms for wire-break, short-circuit, fuse blow, or missing load voltage. However, it includes green status LEDs for each digital output channel, clearly indicating the active state of each relay.

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. The module operates reliably within an ambient temperature range of 0 °C to 60 °C.

Installation Guidelines

Installing the 6ES7322-1HF01-0AA0 is a straightforward process. Start by disconnecting the power supply to your S7-300 rack. Mount the module onto the DIN rail by snapping it into place, then secure it with the mounting screws. Connect the 20-pin front connector, ensuring proper wiring for your specific application. Remember that relay outputs are polarity-independent for AC loads, but DC loads require correct polarity. Finally, configure the module in your STEP 7 hardware configuration and download the updated project.

Packaging List

• Siemens 6ES7322-1HF01-0AA0 SM 322 relay output module (1 unit)

• Labeling strips (1 set)

• Manual (1 copy)

Shipping Method: FedEx, UPS, DHL

Frequently Asked Questions (FAQ)

1. Can the 6ES7322-1HF01-0AA0 switch both AC and DC loads?
Yes, the relay outputs support both 24 V DC and 230 V AC loads at 2 A, providing excellent application flexibility.

2. What is the expected relay life for this SM 322 module?
At 230 V AC and 2 A, it supports 100,000 cycles. At 24 V DC and 2 A, the relay life extends to 300,000 cycles.

3. Does this Siemens output module include short-circuit protection?
No, relay outputs do not have electronic short-circuit protection. External fusing is recommended for each output.

4. What is the maximum switching frequency for this relay module?
For resistive loads, the maximum is 2 Hz. For inductive loads, it is 0.5 Hz. Mechanical switching without load reaches 10 Hz.

5. Is the 20-pin front connector included with the 6ES7322-1HF01-0AA0?
No, the front connector is not included. You must order it separately for this SM 322 module.