4. Configuration
87
Figure 4-18 MODBUS RTU Master Setup Screen
Direct representation variables (%Q) for the protocol diagnostic:
Initial Address of
Diagnostics in %Q
Initial address of the
diagnostic variables
Table 4-53. MODBUS RTU Master Configuration
Notes:
Initial Address of Diagnostics in %Q: this field is limited by the size of outputs variables (%Q)
addressable memory of each CPU, which can be found in chapter Technical Description.
Default Value: the factory default value cannot be set to the Initial Address of Diagnostics in %Q
field, because the creation of a Protocol instance may be held at any time on application
development. The MasterTool IEC XE software itself allocate a value, from the range of output
variables of direct representation (%Q), not used yet.
The diagnostics and MODBUS protocol commands are described in Table 4-45.
The communication times of the MODBUS Master protocol, found on the button "Advanced ..." in
the configuration screen are divided into Transmission Delay and Minimum Interframe, further
details are described in section Mappings Configuration – Symbolic Mapping Settings.
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General