Instruction Manual

6-16 Using Explicit Messaging
20-COMM-D DeviceNet Adapter User Manual
Publication 20COMM-UM002G-EN-P
Write Multiple Parameters
ControlLogix Controller Example Ladder Logic Program to Write Multiple
Parameters Using RSLogix 5000 Software, Any Version
A Scattered Write message is used to write to multiple parameters. This
write message example writes the following values to these five parameters
in a PowerFlex 7-Class drive.
See DPI Parameter Object
on page C-13 (Class Code 0x93) for parameter
numbering.
Important: See Table 6.A on page 6-2
for limitations of PowerFlex 7-Class
and PowerFlex 750-Series drives when using DPI Parameter
Class code 0x93 for explicit messaging.
Table 6.G Example Controller Tags to Write Multiple Parameters
Figure 6.16 Example Ladder Logic to Write Multiple Parameters
Important: If the explicit message scattered write must be written
continuously, then use a separate explicit message single write
for each parameter using DPI Parameter Object Class code
0x93 and attribute A (10 decimal; see page 6-11
). Attribute A
writes to RAM—not NVS (EEPROM) memory. This example
scattered write message using attribute 0 writes to NVS. Over
time, continuous writes will exceed the EEPROM life cycle and
cause the drive to malfunction.
PowerFlex 7-Class Drive Parameter Write Value
141 - [Accel Time 2] 11.1 Sec.
143 - [Decel Time 2] 22.2 Sec.
105 - [Preset Speed 5] 33.3 Hz.
106 - [Preset Speed 6] 44.4 Hz.
107 - [Preset Speed 7] 55.5 Hz.
Operand Controller Tags for Write Multiple Message Data Type
XIC Execute_Scattered_Write_Message BOOL
MOV Scattered_Write_Request_Internal_Use_Only[0] SINT[31]
COP Scattered_Write_Request[0] INT[15]
MSG Scattered_Write_Message MESSAGE
TIP: The MOV (Move) and COP (Copy) instructions are required to
convert the data into the necessary data types, and to align the data into a
usable display format.