Available Product Variants Opto Trigger IV
Trigger extension board OPTO trigger IV is available in 6 product variants.
The OPTO trigger board supports single-ended and differential incoming signals. The product variants differ in number and type of their inputs (how many single-ended inputs, how many differential inputs). You can either use
- all inputs of port A and B as single ended inputs (alltogether 8 single-ended IN signals, as available on Opto Trigger board IV Classic),
- all inputs of port A and B as differential inputs (alltogether 4 pairs, i.e., 4 differential IN signals, as available on Opto Trigger board IV DS), or
- a mixed variant (4 single-ended, 2 differential IN signals, as available on Opto Trigger board IV DS/SE).
Each of the three options mentioned above is available in a pull-up and a pull-down variant. If you need the pull-up or the pull-down variant depends on the electrical source of the signal:
- Use the Pull-Up variant (10 kΩ) to receive a signal from a NPN transistor (open collector, open drain).
- Use the Pull-Down variant (10 kΩ) to receive a signal from a PNP transistor (open emitter, open source).
- To receive TLL signals (or, in general, signals of 5-25 V), you can use both, the pull-up and the pull down variant.
In most application scenarious, you will need to use a Pull-Up variant of the OPTO trigger board.
See the table below for a first overview:
The pin numbers are related to the two SUB-D15 female plugs (Port A and Port B) on the Opto trigger board:
Each Opto trigger board has 8 inputs and 8 outputs (4 IN port A, 4 IN port B, 4 OUT port A, 4 OUT port B).
For a detailed description of the pin configuration, see section Pin Configuration
Details on the variants of Opto Trigger IV:

The Opto Trigger IV (classic) provides 8 single-ended inputs for TLL or open collector/open drain (NPN) signals:

The trigger board Opto Trigger IV Pull-Down (classic) also provides 8 single-ended inputs, but for TLL or open emitter/open source (PNP) signals.

The trigger board Opto Trigger IV DS Pull-Down also provides 8 differential inputs (4 pairs), but for TLL or open emitter/open source (PNP) signals:

The trigger board Opto Trigger DS Pull-Up provides 8 differential inputs (4 pairs) for TLL or open collector/open drain (NPN) signals:

The trigger board Opto Trigger DS/SE Pull-Up provides mixed input types for TLL or open collector/open drain (NPN) signals:
- 4 differential inputs (2 pairs) on port A for TLL or open collector/open drain (NPN) signals, and
- 4 single-ended inputs on port B for TLL or open collector/open drain (NPN) signals.

The trigger board Opto Trigger IV DS/SE Pull-Down also provides mixed input types, but for TLL or open emitter/open source (PNP) signals:
- 4 differential inputs (2 pairs) on port A for TLL or open emitter/open source (PNP) signals, and
- 4 single-ended inputs on port B for TLL or open emitter/open source (PNP) signals.