HIMA F3331 Digital Output Module

Hardware Specifications

Output Channels and Load Conditions

The F3331 provides eight digital output channels for safety-related switching tasks. Each output supports resistive or inductive loads up to 500 mA, subject to the specified 12 W limit. Lamp connections support loads up to 4 W.

The module includes integrated safety shutdown and safe isolation. If the L- supply fails, the module does not provide an output signal. Its internal voltage drop reaches a maximum of 2 V at a 500 mA load, so this value should be considered when checking the voltage available to the connected load.

Line Monitoring and Fault Detection

The F3331 monitors output lines for line breaks and supports short-circuit protection. The specified line resistance limit is 11 Ohm for the combined outgoing and return conductors. Line resistance must remain within this limit to meet the stated operating conditions.

The documented line-break detection current ranges from 0.5 to 9.5 mA, while the short-circuit current ranges from 0.75 to 1.5 A. These ranges reflect operating-point variations caused by component tolerances. The maximum output leakage current is 350 uA, and the reset output voltage is limited to 1.5 V.

Automatic Testing During Operation

The module automatically tests its operation using several routines:

• Output readback: The module reads back output signals to check switching states. The operating point for reading back a logic 0 is at or below 6.5 V. A fault may raise the logic 0 level to this threshold without detection.
• Switching capability: The module checks whether the test signal can switch as expected.
• Cross-talk detection: A walking-bit test checks for unwanted interaction between output channels.
• Line monitoring: The module checks output wiring for line-break conditions.

The test signal lasts no more than 200 us. During system design, the readback threshold and detection limits should be considered when evaluating fault coverage and connected load behavior.

Power Requirements and Installation Space

The F3331 draws 130 mA from the 5 VDC supply. Its specified 24 VDC current consumption is 180 mA with additional load. The module occupies 4 TE of installation space.

The permitted line resistance, load ratings, and undervoltage trip threshold are relevant when checking the field wiring and power supply. Confirm the applicable rack configuration, terminal arrangement, and system requirements against the documentation for the installed HIMA system before replacement or commissioning.

Frequently Asked Questions

Q: How many output channels does the HIMA F3331 provide?

A: The F3331 provides eight digital output channels. Each output supports resistive or inductive loads up to 500 mA and 12 W, while lamp connections are limited to 4 W.

Q: What fault monitoring functions does the F3331 support?

A: The module supports line monitoring, short-circuit protection, output readback, switching-capability testing, and cross-talk testing. Its line-break detection current ranges from 0.5 to 9.5 mA, and the specified short-circuit current ranges from 0.75 to 1.5 A.

Q: What electrical limits should be checked before installing the F3331?

A: Check the load current and power, combined outgoing and return line resistance of no more than 11 Ohm, the undervoltage trip threshold of 16 V or below, and the specified 5 VDC and 24 VDC supply requirements. Also consider the output readback threshold when evaluating fault detection.