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The 4–Channel Analog Current Input module, IC694ALG221, provides four analog input channels. This module has two possible input ranges: ▪ 4 to 20 mA ▪ 0 to 20 mA Two range jumpers are provided with the module; one for channels one and two, and the other for channels three and four. Conversion speed for each of the four channels is one–half millisecond. This provides an update rate of two milliseconds for any channel. Resolution of the converted signal is 12 bits binary (1 part in 4096) over either range. Input protection for the module is sufficient for operation with reduced performance with up to 200 V common–mode. The module provides electrical isolation of externally generated noise between field wiring and the backplane through the use of optical isolation. This module can be installed in any I/O slot of an RX3i system. Isolated +24 VDC Power If this module is located in an RX3i Universal Backplane, an external source of Isolated +24 VDC is required to provide power for the module. The external source must be connected via the TB1 connector on the left side of the backplane. If the module is located in an Expansion Backplane, the backplane’s power supply provides the Isolated +24 VDC output for the module. LEDs The Module OK LED is ON when the module’s power supply is operating.

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