531X307LTBAJG1 Gas turbine module

MB Address in Device This parameter specifies the starting Modbus register or digital point address to be considered by the command in the Modbus slave device. Refer to the documentation of each Modbus slave device on the network for their register and digital point address assignments. For example, in an Omni Flow Computer, points 1901 to 1936 are digital points used for alarm flags. These points can be read using Modbus Function Code 1 and placed in the module’s internal database

Ladder Logic

Ladder logic is required for application of the MVI69-MCM module. Tasks that must be handled by the ladder logic are module data transfer, special block handling, and status data receipt. Additionally, a power-up handler may be needed to handle the initialization of the module’s data and to clear any processor fault conditions. The sample ladder logic, on the ProSoft Solutions CD-ROM, is extensively commented, to provide information on the purpose and function of each rung. For most applications, the sample ladder will work without modification.

Ladder Logic and Firmware Compatibility Note 

Important: MVI69-MCM modules with firmware version 1.21 and newer cannot use ladder logic written for earlier firmware versions. Please use the ladder logic or Add-On Instruction specifically labeled for your MVI69-MCM module’s firmware version. Firmware version 1.21 includes the following changes to the pass-through control blocks:
Mutual exclusion on Pass-Through Block IDs 9956, 9957, 9958, and 9959 from both ports - If both ports are configured as slave ports, when both of the slave ports receive write commands with the same Function Code, which would need to use the same block identifier from the above list, the module will process the command from the port which first received the command and will return an Exception Code error code 6 (node is busy - retry command later error) from the other port that received the command last. The Master will retry the command on the busy port after a short delay. This prevents Pass-Through blocks on both ports from overwriting each other.
The Pass-Through Block ID is now written by the module into the first word, the (0) offset, of the processor's backplane input image. Previously this location contained a 0 (zero) value. Ladder logic for earlier firmware versions will not work with MVI69-MCM firmware version 1.21 or later.

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