5.8 EXTERNAL MODULE (TASKS 0-23)
The External Module provides a total of 24 (0-23) tasks that are used to transfer data between the controller and networked devices.
Each task is capable of performing a read, write, or bidirectional operation. To configure an External Module task, the following parame-
ters listed in Table 5-8 must be specified:
•
A Remote Point(er) to the external device and its variable data, for example, 10H002 in a MicroLink peer-to-peer network would
point to the variable data of datapoint H002 in instrument 10 and similarly, PIC203.PV in a HART network would point to the vari-
able data in the instrument tagged PIC203.
•
A Local Point(er) to the 53MC5000 Controller datapoint address that is either the data source for write and bidirectional operations
or the variable data destination for a read operation. For example, C100 would access the controller PV for CON Module 0.
•
A Scan time, which determines the rate at which the task is repeated.
•
A Mode that specifies the type of data transfer (write, read, or bidirectional).
•
A Status, which does not have to be configured, as it indicates if the task execution was successfully completed within the defined
scan time or not.
An example of a Task 0 read operation that accesses AI2 (datapoint H002) from controller 10 on the MicroLink network and stores the
data into datapoint H092 in the local controller is as follows:
➀
REMOTE POINT, A128 = 10H002;
➁
LOCAL POINT, F352 = H092;
➂
SCAN, B400 = 5 FOR FIVE SECONDS;
➃
MODE, B424 = 1
TO READ THE VARIABLE DATA FROM THE ADDRESSED CONTROLLER AND WRITE IT TO THE DATAPOINT INDIRECTLY AD-
DRESSED BY THE LOCAL POINT;
➄
STATUS, L200 = 0 OR 1 (NOT CONFIGURED, IT IS AN INDICATOR).
This task configuration will have the following result:
➂
Every Scan of 5 seconds,
➃
Read
➀
AI2 from controller 10
➃
and write it
➁
to H092 as specified by the Local Point.
➄
The Task Status remains a 1 to indicate a successful operation.
5-11
Section 5. Configuration Parameters
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