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GENERAL This document describes about Model ALP121 PROFIBUS-DP Communication Module (for FIO) which performs as the PROFIBUS-DP master device (referred to as the master device) to communicate and exchange data with PROFIBUS-DP slave devices (*1) (referred to as the slave device). This PROFIBUS-DP communication module can be mounted on field control units (AFV30, AFV40). It can also be mounted on the ESB bus node unit (ANB10) and the optical ESB bus node unit (ANB11) which are connected to AFV30 or AFV40. *1: The PROFIBUS-DP slave devices represent the field bus devices connected to a PROFIBUS-DP communication cable. PROFIBUS remote I/O, PLC, and others are among the PROFIBUS-DP slave devices. HART devices and 4-20 mA analog equipment are connected to PROFIBUS remote I/O. ALP121 module can also be connected with PROFIBUS-PA devices via a PROFIBUS DP/PA coupler and refer to the PROFIBUS-PA device data.

Redundancy of Communication It is possible to make the communication dual-redundant by installing ALP121 modules in an odd-number slot and the next slot (the odd number + 1) of the same node unit. Two types of ALP121 dual-redundant configuration are applicable. PROFIBUS-DP communication module dual-redundant configuration Install a pair of ALP121 modules on an FCS to make them work in the same PROFIBUS-DP network. The control side ALP121 module exchanges data with the slave devices. The stand-by side ALP121 module monitors the communication status of the control side ALP121 module.