Faq; Mdc-211-Zt; Q2 - What Is The Maximum Number Of Data Can Be Accessed In One Command From A Modbus Master Device; Q3 - How Are The Internal Registers Corresponding To The Polled Data In A Mdc- 211-Zt - ICP DAS USA MDC-211-ZT User Manual

5. FAQ

Q1 - What are the maximum numbers of polling definition and Internal
Register in a MDC‐211-ZT?
The maximum number of polling definition in a MDC‐211-ZT is 240 commands, each
definition can access up to 64 Internal Registers. Each of the four tables (DI/DO/AI/DO) can
store up to 9600 Internal Registers for polled data.
Q2 - What is the maximum number of data can be accessed in one
command from a Modbus Master device?
By the Modbus TCP protocol, the maximum amount of Internal Registers that one Modbus
command can access is 255 of function code 01 and 02, and 126 of function code 03 and 04.
Q3 - How are the Internal Registers corresponding to the polled data in a
MDC‐211-ZT?
Please refer to the "2.6.2 Inquire Corresponding Modbus Register Address" for the detail
information.
Q4 - How to write data to output channels on a Modbus RTU Slave device?
 Web Interface Operation
Refer "2.6.3 Testing I/O Channel Status of Modbus RTU Device" for the detail information.
ICP DAS, MDC-211-ZT user manual , v1.0 Page 38
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