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

Overview

SIEMENS SIMATIC S7-300

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

An isolated eight-relay output module for 24 V DC or 230 V AC loads, with 2 A rated switching current, a 20-pin front connector and channel-status LEDs.

At a Glance

Brand	Siemens
Model	6ES7322-1HF01-0AA0
Product Type	Relay digital output module
Core Function	Switches external field loads
Application	Compatible SIMATIC S7-300 stations

Relay switching

The contacts switch both the specified DC and AC loads.

Grouped isolation

The outputs are isolated in groups of two channels.

External protection planning

Short-circuit protection is not integrated into the module.

Product Overview

6ES7322-1HF01-0AA0 provides eight relay outputs for an S7-300 station requiring isolated field-load switching.

Green output LEDs show the channel states, while the relay contact limits, switching frequency and operating-life figures determine the suitable load duty.

Ordering focus: Select the 20-pin front connector and external load protection, and size the relay duty using the 2 A switching rating rather than the separate thermal continuous-current figure.

Key Functions

Switch AC or DC loads with relay contacts

The outputs provide the specified 2 A switching capability at 24 V DC or 230 V AC.

Separate the field-load groups

Channels are isolated in groups of two, with optocoupler separation from the backplane bus.

Indicate output states locally

Green LEDs indicate the digital-output states, while diagnostic alarms and dedicated wire-break or short-circuit diagnostics are not provided.

Official Specifications

Output Channels	8 relay outputs
Rated Switching Capacity	2 A at 24 V DC or 230 V AC
Minimum Load Current	5 mA
Relay Supply Voltage	24 V DC
Maximum Supply Current	160 mA from L+; 40 mA from the 5 V backplane bus
Typical Power Loss	3.2 W
Resistive and Lamp Switching Frequency	2 Hz maximum
Inductive Switching Frequency	0.5 Hz maximum
Maximum Mechanical Switching Frequency	10 Hz
Contact Operating Life at 2 A	100,000 cycles at 230 V AC; 200,000 at 120 V AC; 300,000 at 24 V DC
Maximum Thermal Continuous Current	3 A
Maximum Lamp Load	50 W
Isolation Arrangement	Groups of two channels; optocoupler separation from the backplane
Insulation Test Voltage	1,500 V AC
Maximum Cable Length	1,000 m shielded; 600 m unshielded
Front Connector	20-pin
Overall Dimensions	40 × 125 × 120 mm (W × H × D)
Approximate Weight	190 g

Official source:Siemens SM 322 Relay Output Data Sheet

Frequently Asked Questions

Can I switch both 24 V DC and 230 V AC loads with 6ES7322-1HF01-0AA0?

The relay outputs are rated for 2 A at either 24 V DC or 230 V AC.

Can I parallel two outputs on 6ES7322-1HF01-0AA0 to increase the permissible load current?

Parallel switching for current uprating is not permitted.

Can outputs on 6ES7322-1HF01-0AA0 be paralleled for redundant control of one load?

Parallel switching for redundant control of a load is permitted.

Does 6ES7322-1HF01-0AA0 protect its relay outputs against a load short circuit?

The module has no integrated output short-circuit protection.

Is the 3 A thermal rating of 6ES7322-1HF01-0AA0 the normal switching-current limit?

The rated switching current is 2 A, while 3 A is the separate thermal continuous-current limit.

How often can 6ES7322-1HF01-0AA0 switch an inductive load?

The maximum switching frequency for an inductive load is 0.5 Hz.

Will 6ES7322-1HF01-0AA0 send a diagnostic alarm when a relay load wire breaks?

The module provides neither wire-break diagnostics nor diagnostic alarms.

Compatibility & Ordering Notes

Before ordering 6ES7322-1HF01-0AA0: Match the relay switching duty, the 20-pin front connector and the load-protection arrangement to the existing S7-300 installation.

Compatibility Checklist for 6ES7322-1HF01-0AA0

• Use a compatible S7-300 station position and the required 20-pin front connector.
• Keep switched loads within the 2 A contact rating and 5 mA minimum load.
• Use the applicable inductive, resistive or lamp switching-frequency limit.
• Provide external protection because output short-circuit protection is absent.
• Do not parallel outputs to increase the current rating.
• Account for contact life at the actual load voltage and switching duty.

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