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Ethernet Interface Operational Restrictions
The Ethernet Interface (Type 2) operates with some restrictions when used with IC697 PLC CPU versions 4.12 through 5.50. These Operational Restrictions, together with differences in Startup, Station Manager and Software Loader operation, are described below.
COMMREQ operation is not supported. Any COMMREQ issued to the Ethernet Interface is ignored; a COMMREQ Status (CRS) word is not returned to the PLC. Instead, the Ethernet Interface generates an event in its internal exception log (Event = 1c; Entry 2 = 11H) indicating that the Channel API task is not active. The Ethernet Interface also generates an
entry in the PLC Fault Table: (“LAN
The Ethernet Interface returns neither LAN Interface Status (LIS) nor Channel Status data to the PLC.
PLC CPU models IC697CPU73x and IC697CPU77x may limit the overall performance of a PLC used as a server device. Under heavy load from other clients and hosts on the network, the server PLC may generate errors with major error code 07, indicating that the volume of requests from the network have momentarily exceeded the processing capacity of the PLC CPU. The request will need to be retried. If possible, try to reduce the volume of requests to the server PLC when this condition occurs. If the system design requires data rates beyond the capacity of the server PLC CPU, please consider upgrading to a more powerful CPU model.
Startup
Upon each powerup or restart of the Ethernet Interface, or configuration store to the PLC, the following entry will be generated in the PLC Fault Table for the slot containing the Ethernet
Interface: (“Reset of, addition of, or extra option module”).
When operating with PLC CPU versions prior to 6.00, the Ethernet Interface does not generate the exceptions or PLC Faults that normally occur when Ethernet Interface does not receive module configuration from the PLC CPU.
Each powerup and restart of the Ethernet Interface takes approximately 20 seconds. This is roughly 10 seconds longer than required when the Ethernet Interface is used with PLC CPU versions 6.00 and later.
Station Manager
The STAT C command (PLC Driver status) does not display the current PLC CPU state (RUN/STOP and I/O ENABLED/ I/O DISABLED).
In the TALLY C command output (PLC Driver tallies), the “PlcSweep” tally does not count the number of PLC sweeps. This tally should be ignored.
The STAT H command (Channel API status) always indicates “Channel API task not initialized”
As detailed in “Ethernet Interface Installation and Configuration”, special restricted operation notification is displayed with the startup message and by the NODE command.
Software Loader
It is not possible to perform a fimware load to this Ethernet Interface while it is operating with a Series
TCP/IP Ethernet Communications for the Series 90™ PLC User's Manual– May 2002 |
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