ICP DAS USA GW-7552-B User Manual page 61

5.3.3 Space configuration in modbus：
The window of "Space Configuration in Modbus" divided into 3 parts to explain,
as shown in figure 59.
(1) Select module:
The user can select check box of the module to show memory address
configuration of DI/DO/AI/AO in Modbus network.
(2) Display interface:
The user can click "Write Output" button to show DO/AO memory
address configuration of output modules in Modbus network, click "Read
Input" button to show DI/AI memory address configuration of input
modules in Modbus network, click "Read Output" button to show DO/AO
memory address configuration of input modules in Modbus network.
(3) Color display:
The user can discriminate states of Modbus address configuration by
different color. White means the address is not used. Light blue means the
address was configured by a module. Mazarine means the address was
configured by many modules, but Modbus ID is not repeat in these
modules. Red means the address was configured by many modules and
Modbus ID is repeat in these modules. The data may be read and written
by different modules at this time, it may make the data transmit and
device control error easy because address configuration and Modbus ID
overlap.
GW-7552-B / GW-7552-M PROFIBUS/MODBUS GATEWAY User Manual (Version 1.60, May/2017) PAGE: 61