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I / O system, 4 digital inputs, sink, 12V / 24VDC, manufacturer code: ST1214..

I / O system, 8 digital inputs, sink, 12V / 24VDC, manufacturer code: ST1218..

I / O system, 16 digital inputs, sink, 12V / 24VDC, manufacturer code: ST121F..

I / O system, 4 digital inputs, sink, 48 VDC, manufacturer code: ST1314..

I / O system, 4 digital inputs, 110 VAC (85 to 132 VAC), manufacturer code: ST1804..

I / O system, 4 digital inputs, 220 VAC (170 to 264 VAC), manufacturer code: ST1904..

I / O system, 4 digital outputs, TTL, 5 VDC / 20 mA, inverted, manufacturer code: ST2114..

I / O system, 4 digital outputs, TTL, 5 VDC / 20 mA, non-inverted, manufacturer code: ST2124..

I / O system, 16 digital outputs, source, 24 VDC / 0.5 A, manufacturer code: ST222F..

I / O system, 4 digital outputs, source, 24 VDC / 0.5 A, manufacturer code: ST2324..

I / O system, 8 digital outputs, source, 24 VDC / 0.5 A, manufacturer code: ST2328..

I / O system, 4 digital outputs, source, 24 VDC / 0.5 A, diagnostics, manufacturer code: ST2424..