The Block I/O Analog Modules from Danaher comprise a distributed analog interface series for PiC and MMC systems, with versions for four-channel analog input, four-channel 4–20 mA output, four-channel ±10 V output, and combined four-input/four-output analog control.
The series is designed to connect field devices such as pressure, flow, speed, position, and temperature transmitters, with input modules converting unipolar or bipolar voltage and current signals into digital values and output modules converting controller commands into analog current or voltage signals. Depending on the model, the modules provide 14-bit analog input resolution, 15-bit 4–20 mA output resolution, or 16-bit ±10 V output resolution, and the combined input/output version supports both 14-bit input conversion and 16-bit voltage output in one unit. These modules operate from an external 24 VDC supply and are built around the Block I/O communication architecture, which uses RS485-based links, optically isolated communication paths, and compact housings suited for distributed installation near machine devices. For industrial reliability, the manuals specify shielded twisted-pair field wiring, software-based scaling and adjustment instead of hardware pots or switches, and protective behaviors such as current-limited outputs or automatic reset to safe output values when scan loss occurs.
