Omron CompoBus/D (DeviceNet) Communications Card 3G3FV-PDRT1-SIN Benutzerhandbuch
5-8
5-2
Message Communications (DeviceNet Explicit Messages)
There are two types of CompoBus/D communications: Remote I/O and message communications. This
sections explains CompoBus/D Communications Card message communications. With message
communications, specific instructions (SEND, RECV, CMND, and IOWR) are used for reading and writ-
ing data between Master and Slave Units.
sections explains CompoBus/D Communications Card message communications. With message
communications, specific instructions (SEND, RECV, CMND, and IOWR) are used for reading and writ-
ing data between Master and Slave Units.
5-2-1 Overview of Message Communications (Explicit Message
Operations)
H
Message Communications Operations
Message communications enable data to be exchanged as required between nodes (i.e., between
Masters or between Masters and Slaves) on a CompoBus/D Network. For example, the accumulated
data from a given PC can be read from another PC, and constants from various Slaves can be changed
from a PC. To use message communications, however, both nodes involved in the data exchange must
support message communications.
Masters or between Masters and Slaves) on a CompoBus/D Network. For example, the accumulated
data from a given PC can be read from another PC, and constants from various Slaves can be changed
from a PC. To use message communications, however, both nodes involved in the data exchange must
support message communications.
C200HW-DRM21-V1 or
CVM1-DRM21-V1 (Master Unit)
CVM1-DRM21-V1 (Master Unit)
Message communications function
Reading Inverter
output current
output current
3G3FV-series Inverter
3G3FV-PDRT1-SIN CompoBus/D
Communications Card
Note: T-branch wiring using Thin Cables
Communications Card
Note: T-branch wiring using Thin Cables
H
Types of Message Communications
CompoBus/D message communications are broadly divided into the two categories described below.
Of these two categories, the Inverter’s CompoBus/D Communications Card supports explicit mes-
sages.
Of these two categories, the Inverter’s CompoBus/D Communications Card supports explicit mes-
sages.
•
Explicit Messages
Explicit messages are defined by DeviceNet. The class, instance, and attribute are specified for
executing message communications. The messages are the same for all Inverter products, so mes-
sages can be exchanged in the same way with masters made by other manufacturers.
Explicit messages are defined by DeviceNet. The class, instance, and attribute are specified for
executing message communications. The messages are the same for all Inverter products, so mes-
sages can be exchanged in the same way with masters made by other manufacturers.
•
FINS Messages
Messages can be exchanged using FINS commands between CompoBus/D nodes (Masters and
Slaves) that support FINS messages. (FINS commands are actually sent and received using Device-
Net explicit messages.)
Messages can be exchanged using FINS commands between CompoBus/D nodes (Masters and
Slaves) that support FINS messages. (FINS commands are actually sent and received using Device-
Net explicit messages.)
CompoBus/D Communications Card Operations
Chapter 5