IO-3 Combination Analog Digital I/O Module – 8 Input/5 Output

The combination analog/digital I/O module provides:

Analog I/O

This module provides two signal ranges, 0 to 20mA and 4 to 20mA. The default range is 4-20mA. A link on the rear of the module selects 4-20mA (link installed) or 0-20mA I/O for all channels.

Resolution of the converted signals is 12 bits binary (1 part in 4096). The sign bit is not used in the conversion process. All channels are updated four times per second.

All inputs share a single common and all outputs share a separate common at the zero volt rail.

Input protection for the module is sufficient to guarantee operation with reduced performance with up to 1500V common-mode. The module provides electrical isolation of externally generated noise between field wiring and the backplane through the use of optical isolation.

Digital I/O

Input characteristics are compatible with a wide range of user supplied input devices, such as push buttons, limit switches and electronic proximity switches, whilst outputs can control a wide range of user supplied load devices such as: motor starters, solenoids and indicators.

Power for the internal relay circuits is provided by the +12VDC bus on the backplane. The user must supply the AC or DC power to operate field devices. An internal fuse protects the relay contacts should ratings be exceeded.