Features - Mitsubishi Electric A1SJ71DN91 User Manual

1. OUTLINE
1. OUTLINE

1.1 Features

DeviceNet network
This manual gives information including the specifications and descriptions of parts of the
AJ71DN91/A1SJ71DN91 DeviceNet Master Unit (hereafter AJ71DN91, A1SJ71DN91, or
DN91), which is used in combination with the MELSEC-A/QnA Series PLC CPU.
DN91 is the DeviceNet master station which controls the DeviceNet devices.
See the DeviceNet Specifications (Release 2.0) Volume 1 and Volume 2 for details about the
DeviceNet Specifications.
DeviceNet is a registered trademark of the Open DeviceNet Vendor Association, Inc.
POINT
While it is considered connectable with most commercially available Device-Net
products, we cannot guarantee the connectivity with products of other manufacturers.
This section describes the features of DN91.
(1) Conforms to the DeviceNet specifications (Release 2.0).
(2) DN91 operates as the DeviceNet master station to permit I/O and message
communications with the DeviceNet slave stations.
(3) Each master unit can communicate with up to 63 slave stations.
(4) The communication method for I/O communication can be selected indepen-dently for
each slave station from the following four methods prescribed for DeviceNet: polling, bit
strobe, change of state, and cyclic.
However, only one communication method can be selected for each slave station.
Slave station 1
(5) I/O communication permits communication of 256 bytes of inputs (2048 points) and 256
bytes of outputs (2048 points) in the edit mode.
(6) Each message communication can communicate 240-byte message data.
(7) Any of the following two methods may be used to set the DN91 parameters:
•
Use TO command of the sequence program to set the parameters.
•
Use the configuration software to set the parameters. (Refer to the Section 2.2.3 for
the configuration software.)
DN91
Polling
Bit strobe
Slave station 2 Slave station 3
−
1 1
MELSEC-A
Change of state
Cyclic
Slave station 4