Use Opto 22 Relays with TTL-Level I/O Lines!
A solid-state relay requires more current to switch on than most Intel® 8255-based (TTL-level) digital I/O boards can provide. Output buffer chips built into our CYSSR 24 relay mounting rack provides 16mA of current sink per channel. By providing the current sink on the relay panel, we've made it possible to use solid-state relays with virtually any TTL-level digital I/O board, regardless of whether or not your digital I/O board provides a sufficiently high current sink.
The CYSSR 24 mounting rack can use standard or mini-size Opto 22-style solid-state relays (see our "CY" series). Each of the 24 positions can be used to mount a solid-state power controle module. Mix and match the input (sensing) and the output (relay) modules in 4- or 8-module groups, just as you would when mounting them on our standard CY PB24 panel.
The CYSSR 24 has both 37-pin and 50-pin connectors for easy cabling to most I/O boards. Use the two 50-pin connectors, "IN" and "OUT," to daisy-chain a second CYSSR 24 panel.
Note: Our CYSSR 24L-5PK is special order, for a pack of five panels. (If you need more than five, please call.) Leadtime approximately 8 weeks. Sorry, no returns on this item.