One of the most valuable checks you can make on your system just takes a minute and a voltmeter. Voltage provided to Opto 22 products must meet minimum requirements, or Bad Things happen.
The voltage specification for SNAP racks (both older versions and SNAP PAC racks) is 5.00 to 5.20VDC. If you're using an adjustable power supply, PSG recommends adjusting it to the upper end of this range (5.10 to 5.20 VDC) for best results, but make sure it's not over 5.20! Following this recommendation should help eliminate many startup, maintenance, and intermittent issues. For SNAP racks, measure and adjust the voltage downstream of the fuse on the rack. This location takes into account the voltage drop across the fuse and makes sure that the I/O processor (brain or on-the-rack controller) and I/O modules receive the correct voltage.
SNAP PAC S-series controllers. Take note of the voltage requirements for your S-series PAC. The SNAP-PAC-S2 has an input range of 8-32 VDC. Earlier models of the SNAP-PAC-S1 had an 8-24 VDC input range, while more recent models have an expanded range of 8-32 VDC. Be sure you check the voltage requirement printed on the top of your controller before applying power. If in doubt, contact Product Support.
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