Omron produce basic I/O modules such as CS Series B7A interface module, DC output module, DC input module, interrupt the input module and quick response input module.

Specifications Omron DC Input Unit

Product Name	Specification					Model
	Number of points	Internal I/O common	Rated input voltage	I/O refreshing method	ON/OFF response time
Omron DC Input Unit (Screwless Clamping Terminal Block, 12 mm Width)	4 points	NPN	12 to 24 VDC	Switching Synchronous I/O refreshing and Free-Run refreshing	20 μs max./ 400 μs max.	NX-ID3317
			24 VDC		100 ns max./ 100 ns max.	NX-ID3343
				Input refreshing with input changed time only *1		NX-ID3344
		PNP	12 to 24 VDC	Switching Synchronous I/O refreshing and Free-Run refreshing	20 μs max./ 400 μs max.	NX-ID3417
			24 VDC	Input refreshing with input changed time only *1	100 ns max./ 100 ns max.	NX-ID3443
						NX-ID3444
	8 points	NPN		Switching Synchronous I/O refreshing and Free-Run refreshing	20 μs max./ 400 μs max.	NX-ID4342
		PNP				NX-ID4442
	16 points	NPN				NX-ID5342
		PNP				NX-ID5442
Omron DC Input Unit (M3 Screw Terminal Block, 30 mm Width)	16 points	For both NPN/PNP	24 VDC	Switching Synchronous I/O refreshing and Free-Run refreshing	20 μs max./ 400 μs max.	NX-ID5142-1
Omron DC Input Unit (MIL Connector, 30 mm Width)	16 points	For both NPN/PNP	24 VDC	Switching Synchronous I/O refreshing and Free-Run refreshing	20 μs max./ 400 μs max.	NX-ID5142-5
	32 points					NX-ID6142-5
Omron DC Input Unit (Fujitsu Connector, 30 mm Width)	32 points	For both NPN/PNP	24 VDC	Switching Synchronous I/O refreshing and Free-Run refreshing	20 μs max./ 400 μs max.	NX-ID6142-6