The IQ231 and IQ233 mid range controllers are specifically designed for field replacement of the older IQ111 (111+) and IQ131 (131+) controllers respectively. They are also useful in new installations, for a broad range of applications. The IQ231 has 16 input/output points, and the IQ233 has 32 points. Options are available for an integral or external 2-line display panel.
