7 — CANopen COMMUNICATIONS
Curtis Model 3150R – Oct. 2022
pg. 36
MESSAGE CENTER
The
displays application-specific messages and is available in all GUIs other than
GUI 3. Messages are transmitted with block SDO transfers of up to 255 bytes. Message substrings
can be formatted for font size and color and can be displayed at any set of coordinates within the
message center area.
The message center has a separate node ID, which is specified with the
parameter.
The following steps describe the process of transmitting a message:
1. Enable the message center.
2. Format the message.
3. Transmit the message.
4. Clear the message.
5. Disable the message center.
The following topics describe these steps.
Enable and Disable the Message Center
The object with an index and sub-index of
0x7021:00
enables and disables messages. The object’s
data size is one byte. To enable the message center, set the object to 1h.
When the message center is enabled, a rectangle highlights the message center area. Any data
normally displayed in that area is hidden while the message center is active. The first example below
is for GUIs 1, 4 and 5, and the second is for GUI 2:
5.0
km/h
123456.7h
K
N
5.0
km/h
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The message center’s height is 140px. The width depends upon the active GUI:
GUI(s)
Width
1, 4 and 5
240px
2
185px