6 COMMUNICATION FUNCTIONS
6.8 Label Access from External Devices
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6.8 Label Access from External Devices
Communication from an external device such as a graphic operation terminal (GOT) to the Motion CPU is possible by
specifying label names.
The external device accesses labels by specifying label names in the label allocation information stored in the Motion CPU.
Label allocation information defines the label names and data types, as well as where each label is allocated.
This makes it possible for external devices to communicate with the Motion CPU by specifying label names, without having to
remember the addresses allocated to each label.
Setting Labels
Set the label to be accessed from an external device in label setting, and check "Access from external device".
Refer to the following for the operation procedures of label setting.
Help of MT Developer2
When label allocation is changed
When a device with a label allocated in the label setting is changed, the Motion CPU follows up by automatically making the
external device refer to the changed device, therefore changing the label settings at the external device is not required.
However, when data type etc. is changed, an update at the external device is required.
The actions at the external device when a label is changed are shown below.
Change at the Motion CPU Change at the external device Remarks
Changed device allocated to label Change at external device not required
Changed the data type of the label Change at external device required Change the data type changed at the Motion CPU
at the external device.
Deleted the label Correct the label deleted at the Motion CPU at the
external device.
Frequency
1234Hz
Temperature
200
Start Stop
Motion CPU
GOT
Setting the Motion CPU and external
device (such as GOT) to enable access
from external devices makes the
communication of a label name from
an external device possible.
Specify a label name and
read or write the data at any
given timing (non-fixed cycle).
The label allocation is returned to any label
read or write query.
Labels that can be accessed by external
devices are stored.
Label name
Frequency
Label allocation information
Read the label “Frequency”
Label address
W0
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