Rockwell Automation 2100-ENET CENTERLINE 2100 Motor Control Centers EtherNet/IP Network Adapter - Manual (Page 39)

Rockwell Automation Publication 2100-UM006A-EN-P - July 2013 39
Configure the I/O Chapter 4
2. Click Download to download the configuration to the controller.
When the download is successfully completed, RSLogix 5000 software
goes into the Online mode and the I/O OK box in the upper-left of the
dialog box is steady green.
3. From the File menu, choose Save.
If this is the first time you saved the project, the Save As dialog box appears.
Navigate to a folder, type a file name, and click Save to save the
configuration to a file on your computer.
To be sure that the present project configuration values are saved, RSLogix
5000 software prompts you to upload them. Click Yes to upload/save.
4. Place the controller in Remote Run or Run mode.
Limitations When Using
PLC-5, SLC 500, or MicroLogix
1100 or MicroLogix 1400
Controllers Controlling I/O with explicit messages is relatively complex compared to normal
implicit I/O control.
ControlLogix and CompactLogix controllers with EtherNet/IP network provide
the easiest and most integrated form of implicit I/O control for an E3 Plus or
825-P module. Programming software RSLogix 5000 software, version 16 or
later, for ControlLogix and CompactLogix controllers contains E3 Plus or 825-P
module Add-on Profiles that, with a few clicks of the mouse, automatically create
all controller tags and an implicit connection at the specified Requested Packet
Interval to control the end device. This connection is monitored at both ends to
be sure that the controller and end device are communicating. A watchdog causes
the end device to fault if the end device does not respond within approximately
100 milliseconds. Therefore, using a ControlLogix or CompactLogix controller
is the preferred method of controlling the end device on EtherNet/IP network.
If you are not using either of these type of controllers, then the E3 Plus or 825-P
module on EtherNet/IP network can be controlled with explicit messages by
using PLC-5, SLC 500, or MicroLogix 1100 or MicroLogix 1400 controllers
with the following limitations:
• An explicit message is a much slower form of control and is
non-deterministic. This means that you cannot guarantee how long the
end device takes to turn an output on or off when the command is given.
Therefore, subject all equipment used in this manner to a risk assessment,
taking into account the mechanical and electrical implementation.
• A timeout value (in seconds) in the adapter issues a fault on the end device
if a message is not received from the controller within the specified time.
However, the controller has no way of detecting a loss of communication
to the end device until the next cycle of explicit messages. This is another
factor in the risk assessment.
• Any additional end devices to be controlled requires additional explicit
messages for their control, and they need to be carefully sequenced. Most
controllers have small communication queues (refer to its user manual),
which need to be carefully managed if messages are not to be lost.