Specifications; Devicenet Communications Specifications - Omron EJ1 - 07-2008 Operation Manual

Specifications

1-2 Specifications
1-2-1

DeviceNet Communications Specifications

Item
Communications protocol
Communications Remote I/O com-
functions munications
Simple I/O alloca-
tion
I/O allocations
from the Configu-
rator
Message commu-
nications
Setting, monitoring
and controlling
operations from
the Configurator
Connection format
Baud rate
Communications media
Communications distance
Communications power supply
Maximum number of nodes that can be
connected
Maximum number of slaves that can be
connected
Terminating resistance of 100 to 125 Ω (1/2 W) must be connected to both
ends of the RS-485 communications transmission path.
Note Connect the DeviceNet Communications Unit to the Temperature Controllers
on the left end of any one of the blocks.
Conforms to DeviceNet
• Master-slave connections (polling, COS, or cyclic)
• Conform to DeviceNet specifications.
• Allocates I/O data using switch settings only, without a Configurator.
• I/O is allocated for Temperature Controller status, process values, set points,
alarm output status, and other basic data only.
• One block for IN Area, up to 86 words (words are allocated through the unit
number set in the highest communications unit number setting)
• One block for OUT Area, up to 74 words (words are allocated through the unit
number set in the highest communications unit number setting)
• Can be used to allocate any I/O data from the Configurator.
• Can be used to allocate any data, such as parameters specific to the
DeviceNet Communications Unit and the Temperature Controller variable area.
• Up to 2 blocks for the IN Area, up to a total of 100 words. (See note 1.)
• One block for OUT Area 1 block, up to 100 words (the first word is always allo-
cated to the OUT Enable Bit). (See note 2.)
• Explicit message communications
• CompoWay/F communications commands can be sent (commands are sent in
explicit message format).
Supported by DeviceNet Configurator (using the Edit Parameters and Device
Monitor functions of the DeviceNet Communications Unit and Temperature Con-
trollers).
• Used to set and monitor the DeviceNet Communications Unit.
• Used to register connection configurations, make initial settings (see note 3),
change settings, and monitor the Temperature Controllers.
• Use to allocates data for master communications.
• Used to allocates word in the IN and OUT Areas for specific data.
• Used to sends operation commands to the Temperature Controllers.
Combination of multidrop and T-branch connections (for trunk and drop lines)
DeviceNet: 500, 250, or 125 kbps, or automatic detection of master baud rate
Special 5-wire cable (2 signal lines, 2 power lines, and 1 shield line)
Baud rate
500 kbps
250 kbps
125 kbps
The values in parentheses apply when Thin Cables are used.
11 to 25 VDC
64 (includes Configurator when used.)
63
Specifications
Network length Drop line length
100 m max. 6 m max.
(100 m max.)
250 m max. 6 m max.
(100 m max.)
500 m max. 6 m max.
(100 m max.)
Section 1-2
Total drop line
length
39 m max.
78 m max.
156 m max.
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