B&B Electronics Zlinx 485 Benutzerhandbuch

DO 

00001 to 00112 

DI 

10001 to 10112 

AI 

30001 to 30112 

AO 

40001 to 40112 

Within these sections, addresses are reserved for all Zlinx 485 modules that may be used.  

Base 

x0001 to x0016 

Expansion 1 

x0017 to x0032 

Expansion 2 

x0033 to x0048 

Expansion 3 

x0049 to x0064 

Expansion 4 

x0065 to x0080 

Expansion 5 

x0081 to x0096 

Expansion 6 

x0097 to x0112 

The following examples show how the addressing works: 

Example 1: To turn on the second digital output (DO2) on the Base Module, the Modbus 
Base Module sends a message placing a logic 1 in memory location 00002. 

Example 2: To cause expansion module 3 to output a specified voltage on AO1, the 
Modbus Base Module sends a message to set the register at Modbus address 40049 to the 
appropriate value. 

A list of all Modbus address assignments for all Zlinx 485 points is shown in Appendix 
D. Several important points about this list should be noted: 

•  Some addresses are listed but not implemented in current versions of Zlinx 485 

hardware. 

•  Some addresses are reserved for internal Zlinx 485 use. 

•  Some addresses are reserved for future use.  

•  40000 series addresses store Analog Output data AND Frequency Counter data when 

Digital Inputs are configured for Frequency Counter operation. For each module, the 
first eight memory locations are assigned to AO data and the next four locations are 
assigned to Frequency Counter data. 

•  If a Modbus device communicating with Zlinx 485 tries to send to or receive from a 

memory address not implemented by the hardware in use, the Zlinx 485 replies with 
an exception response. 

•  Users cannot span across two memory maps, i.e. from 34 to 50.