Saved: 2014-06-18
Filename: Catalyst Ethernet Addendum 1 1 V1_5 released
RACO Manufacturing and
Engineering
Page 6 (21)
4.
Determining Net Port Number &
Protocol
Identifier
The Catalyst Ethernet supports one communication port, named NET 1. In this version of the
product, the Ethernet connectivity is found in the door of the module. The Factory provided
Ethernet cable attaches to the communication card that is mounted on the inside of the door
assembly.
This Ethernet version of the Catalyst supports equally the Modbu sTCP
or
the EtherNet/IP
networks over the Ethernet port.
5.
Communication Registers
The Catalyst behaves in the same way in all of its programming as indicated in the main Catalyst user’s manual
except if desired the Catalyst also monitors the loss of Ethernet communication functions. When addressing the
communication behaviors in Ethernet you should observe these guidelines.
The communication health bit is configured with a special logic to monitor network health of connecting
PLCs – If Ethernet master loses connection, a health byte in address 40125 will go from 0 to 256 or a bit
in address 01992 will go from 0 to 1 indicating that the communication with the network is impaired and
if the Catalyst is programmed to look for this change. A bit flipping from 0 to 1 can report the loss of
communication via an alarm to the users.
To program the loss of communication alarm follow the instructions in the main Catalyst manual and ensure that
the register name space is set accordingly.
Program Channel 56 SNA: 1*2*01992 (channel 56 reads address 01992) ,Alarm on 1 Raw Value, 0 Reported as
'0.'
You may choose any available channel for this function (shown here using channel 56). We recommend using a
channel near the end, i.e., 56, 96 or 256 depending on your model.
Note that Normal means actually talking to the PLC. You would get an alarm if you are plugged into the
Ethernet, but the PLC is not communicating, or if you are not plugged into the Ethernet.
Note also that this bit will use one of the available channels on the Catalyst (in this case channel 56).
6.
Additional consideration
It is good to note these differences in looking for the changes in register values, coils, and bits:
•
Sometimes different types of registers are mapped to different internal memory locations
30001 will go to a particular read-only input register (e.g. temperature), whereas 40001 will go to a
different read/write holding register (e.g. set point).
