Siemens 6ES7322-1BH01-0AA0 SIMATIC S7-300 Digital Output Module

The Siemens 6ES7322-1BH01-0AA0, also cataloged as the SIMATIC S7-300 SM 322 Digital Output Module, operates as a dedicated hardware component for discrete load switching within SIMATIC S7-300 backplane bus network platforms.

Hardware Specifications

Backplane Bus Communication and Network Architecture

The module utilizes the integrated SIMATIC S7-300 backplane bus to execute data exchange with the central processing unit. Power distribution across the 16 channels requires an external 24 V DC supply via a 20-pole front connector. Deterministic communication profiles are governed by the CPU scan cycles, delivering synchronized output state updates over Profinet or EtherNet/IP deterministic networks via the standard interface module paths. Channel-to-channel group scaling and galvanic optocoupler isolation prevent transient noise reflection back into the central processing unit logic circuits.

Frequently Asked Questions

Q: Can the 6ES7322-1BH01-0AA0 module be hot-swapped while the rack is energized?

A: No. Standard SIMATIC S7-300 configurations require the rack power supply to be completely de-energized before removing or inserting I/O modules, unless installed on active bus modules within an ET 200M distributed I/O station.

Q: What happens to the outputs if a short-circuit occurs on an active channel?

A: The channel incorporates electronic short-circuit protection that triggers near 1 A. Once an overload condition is detected, the built-in protection mechanism limits the output current to protect internal components. The status of individual channels is represented via the green front-panel LEDs.

Field Installation Guidelines

• Wiring Allocation: All field connections must terminate at the 20-pole front connector. Ensure correct polarity for L+ (Pins 1 and 11) and M (Pins 10 and 20) across both separate 8-channel groups.
• Thermal Derating Compliance: Maintain specific spacing rules during installation. For horizontal rack configurations, the group current maximum must not exceed 4 A at 40 deg C. For vertical installations, the maximum group load current is restricted to 2 A at 40 deg C.
• Shielding Requirements: When utilizing the maximum 1000 m shielded cable length, the shield braid must be grounded to the central functional earth (FE) rail using low-impedance grounding clamps.