Copyright © 2021 ICP DAS Co., Ltd. All Rights Reserved.
∗
E-mail: [email protected] - 87 -
9. FAQ
Q1: What are the maximum numbers of polling definition and local register?
A1: The maximum number of polling definition in a MDCL-705i is 250, each definition can access up
to 125 registers. Each of the four tables (DI/DO/AI/DO) can store up to 9600 registers of data.
Q2: What is the maximum number of registers can be accessed in one Modbus
command from a Modbus master device?
A2: By following the Modbus protocol, the maximum amount of registers that one command can
access is 255 of function code 01 and 02, and 126 of function code 03 and 04.