Rockwell Automation Publication 750-RM004A-EN-P - April 2018 119
Communication Configuration Chapter 3
DataLink Handling
Comparison
DataLink examples using a Logix controller with Logix V16 and later
firmware. Sample numerical data is interpreted as shown in Ta bl e 69
.
Table 69 - DataLink Handling Comparison
Example Data Drive Type and Comm Option DataLink; Parameter
Information
Parameter Value in
PowerFlex
Tag Value in Logix
(1) (2)
Output Amps PowerFlex 700S;
20-COMM-E/ER
Input DataLink A1;
P297 [Output Curr Disp],
type ‘DINT’, units ‘Amps’, scale
‘10’
Internal value; 12897
P297 displayed as;
= 12897 / 10 = 1289.7
12897
PowerFlex 755T;
Embedded Ethernet
Input DataLink 01;
10:3 [Output Current],
type ‘REAL’, units ‘Amps’
458.9 458.9
Motoring Torque Limit PowerFlex 700S;
20-COMM-E/ER
Output DataLink A1;
P125 [Torque Pos Limit],
type ‘REAL’, units ‘PU’
2.0 2.0
PowerFlex 755T;
Embedded Ethernet
Output DataLink 01;
10:2083 [Torque Limit Pos],
type ‘REAL’, units ‘%’
200.0 200.0
Regen Torque Limit PowerFlex 700S;
20-COMM-E/ER
Output DataLink A2;
P126 [Torque Neg Limit],
type ‘REAL’, units ‘PU’
-2.0 -2.0
PowerFlex 755T;
Embedded Ethernet
Output DataLink 02;
10:2084 [Torque Limit Neg],
type ‘REAL’, units ‘%’
-200.0 -200.0
Network Speed Reference PowerFlex 700S;
20-COMM-E/ER
Pre-defined Output DataLink;
DPI Port 5, Tag ‘SpeedReference’,
Type ‘DINT’
Internal value;
= 16809 / 32767
= 0.513
Comm value; 16809
16809
PowerFlex 755T;
Embedded Ethernet
Pre-defined Output DataLink;
0:211 [Emb Enet Ref], Tag
‘Reference’, Type ‘REAL’
1460.2 1460.2
Selected Speed Reference PowerFlex 700S;
20-COMM-E/ER
Input DataLink A2;
P40 [Selected Spd Ref],
Type ‘REAL’, units ‘RPM’
Internal value; 0.513
P40 displayed as;
= 0.513 * P4 [Motor NP RPM]
0.513
PowerFlex 755T;
Embedded Ethernet
Input DataLink 02;
0:1892 [VRef Selected],
Type ‘REAL’, units
(3)
‘RPM’
1460.2 1460.2
Network Speed Feedback PowerFlex 700S;
20-COMM-E/ER
Pre-defined Input DataLink;
DPI Port 5, Tag ‘SpeedFeedback’,
Type ‘DINT’
Internal value; 0.6578
Comm value;
= 0.6578 x 32767
= 21554
21554
PowerFlex 755T;
Embedded Ethernet
Pre-defined Input DataLink;
Tag ‘Feedback’, Type ‘REAL’
935.7 935.7
Active Speed Feedback PowerFlex 700S;
20-COMM-E/ER
Input DataLink B1;
P300 [Motor Spd Fdbk]
Type ‘REAL’, units ‘RPM’
Internal value; 0.6578
P300 displayed as;
= 0.6578 * P4 [Motor NP RPM]
0.6578
PowerFlex 755T;
Embedded Ethernet
Input DataLink 03;
10:1042 [Vel Fb Active]
Type ‘REAL’, units
(3)
‘RPM’
935.7 935.7
(1) When using Logix V16 and later, DataLink scaling is automatically applied such that Logix values match PowerFlex internal values.
(2) When using Logix V15 and earlier or 16-bit processors, DataLink scaling may need to be done in application programs. See the 16 Bit-based Processor section in this document for more information.
(3) PowerFlex 755T velocity units depend on the setting of parameter 0:46 [Velocity Units]. It is highly recommended that parameter 0:46 be to 1=’RPM’ to match the PowerFlex 700S velocity units of
‘RPM’. The above examples assume P46 = 1 ‘RPM’.
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