Allen-Bradley 1407-CGCM, Руководство пользователя, Страница: 130 / 252

Rockwell Automation Publication 1407-UM001H-EN-P - November 2014
#HAPTER CGCM Unit Software Interface
5NSCHEDULED7RITE-ESSAGE,OGIC
This sample ladder diagram rung provides an example of message control for
writing the Unscheduled Write data table to the CGCM unit.
#ONNECTION"EHAVIORDURING#ONFIGURATION
The CGCM unit operates with an active Class 1 connection with a
ControlLogix programmable controller that you programmed and configured.
The Class 1 connection is made through the module profile. The CGCM unit
controls the state of two bits in the Input data table to interact with the controller
during configuration:
•
ConfigRcvd - indicates that a valid Configuration write is accepted by the
CGCM unit
•
UnschdWriteRcvd - indicates that a valid Unscheduled Write message is
accepted by the CGCM unit
Simplified logic rung to send the Unscheduled Write message from the controller to the 1407-CGCM after the Configuration write has
been accepted. Enable_UW is a user-defined permissive interlock. CGCM:I.ConfigRcvd asserted indicates that the CGCM has
accepted the scheduled Configuration write. After a configuration write, the CGCM turns off CGCM:I.UnscheduledWriteRcvd,
completing the rung input logic. The one-shot fires the message instruction only once.
Enable_UW
CGCM:I.ConfigRcvd CGCM:I.UnschdWriteRcvd
EN
DN
ER
MSG
ONS
shot1
Type - CIP Generic
Message Control
msgWriteUW
)-0/24!.4
The user is responsible for initiating all unscheduled messaging through
the user program.
)-0/24!.4 The message length can be 64 bytes, which avoids writing the kWh,
kVARh, and kVAh presets.