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SMC-Flex Datalink Configuration Reference 1/9/2012

SMC-Flex Datalink Configuration

Datalinks are supported in the SMC-Flex. A Datalink is mechanism used by most drives to

transfer data to and from the controller without using an Explicit Message. The SMC-Flex

only supports 16-bit Datalinks, therefore the device can be configured to return up to 8

additional pieces of parameter information. By default the 8 parameters (parameter# 1, 2,3, 4, 5, 6, 11, 12) are returned in the I/O message when all 4 output Datalinks are

configured. These parameters identify the following values:

Parameter #1 = Voltage Phase A-B

Parameter #2 = Voltage Phase B-C

Parameter #3 = Voltage Phase C-A

Parameter #4 = Current Phase A

Parameter #5 = Current Phase B

Parameter #6 = Current Phase C

Parameter #11 = Power Factor

Parameter #12= Motor Thermal Usage (MTU)

Keep in mind that the returned parameters can be changed by simply changing the values in

programmed in parameters #89 through #103. Also, only output Datalinks are configured by

default. Input Datalinks can be configured, but have limited functionality when used with

the SMC-Flex.

The following example uses all 4 Datalinks. The communication interface used is the 20-

Comm-D DPI to DeviceNet module.

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SMC-Flex Datalink Configuration Reference 1/9/2012

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SMC-Flex Datalink Configuration Reference 1/9/2012

The next step in the configuration is to enable the 20-Comm-D to allow the Datalinks. To do

this the following parameters in the 20-Comm-D need to be configured. Depending on the

configuration tool you are using, these parameters values may be different. The example is

shown using RSNetWorx for DeviceNet:

Parameter #148 DPI I/O Cfg–

 Enable each of the Datalinks being used.Parameter #160 M-S Input – Enable each of the Datalinks being used.

Parameter #161 M-S Output – Enable each of the Datalinks being used.

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SMC-Flex Datalink Configuration Reference 1/9/2012

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SMC-Flex Datalink Configuration Reference 1/9/2012

The last step in mapping the information to the scanner/controller is to select the

appropriate message size. Below is a table that describes the correct I/O size depending on

the number of Datalinks enabled.RxSize

TxSize

Logic Status /Command (16bit)

Reference /FeedBack (16bit)

DataLinks

 A B C D

4 4 x x

8 8 x x x

12 12 x x x x

16 16 x x x x x

20 20 x x x x x x

With the SMC-Flex in the Scanlist insure that the I/O information is correct by selecting

the Edit I/O Parameters. A sample screen is shown below. If these values are different

than what is desired, change them and then click O.K. This may cause some information to

be re-mapped so make sure that you are aware of where it is being mapped.

In this case the output information from the SMC-Flex has been mapped into the following

locations. Keep in mind that the ControlLogix platform is separated into 32-bit words.

DeviceNet Scanner View

from RSNetWorx

ControlLogix Memory Table

from RSLogix5000