Hello Everybody,
I am a long time listener, first time caller. That's not funny. I am trying to diagnose a communication problem and I am looking for a confirmation to my theory or possibly a new avenue to look down. Sorry if this is a bit of a lenghtly read, but I would rather provide too much info than not enough.
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The Press:
SLC 5/05 - Press control PLC
(OS501, Series C, FRN 10)
(Hardware 552, Series C, FRN 5)
PVP 1250 - HMI
Both are connected via ethernet to a Cisco Catalyst 2960 swtich. The switch is also connected to the plants main switch for communication with the outside world.
The Transfer System:
Control Logix 5536 - Transfer PLC
PVP 1500 - HMI
Indramat PPC - Servo Motion Control Unit
3 1794-AENT - Remote IO Units
These devices are tied into a managed switch which also has a connection going the the presses Cisco switch for communication to the press and with the outside world.
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Their is a message of 5 integers being sent back and forth between the press and transfer system using the MSG instruction. One of the integers is brokendown to the bit level for several status bits, including a heartbeat. The problem at hand is that most of the time, the system operates fine, but about 6 times per day the press fautls out because the heartbeat has timed out(This already has a limit of 3 seconds, which is already probably too much for the application.). I have already eliminated 3 issues which were not helping the situation. The last of which was to install the Cisco switch in the press control cabinet. This was originally a cheap Linksys hub (This only used at the time of install because the need for one was overlooked and they had it lying around in the plants server room.). After changing to the switch I noticied something odd. This switch has status lights for each port (Off means no connectivity, a fast green flash means it's running at 100mbps, and slow orange and green flash means it's running at 10mbps.). For about 8 seconds the port will show it's connected at 100mbps and then for about 2 seconds the port will show it's connected at 10mbps (This is not exact or consistant, it will sometimes switch more or less often, and for more or less time.). I have tried changing ports and patch cables to no avail. I am thinking it's the ethernet port on the SLC itself. I was hoping someone else may have come accross this problem before. Any information would be greatly appreciated. Thank You.
I am a long time listener, first time caller. That's not funny. I am trying to diagnose a communication problem and I am looking for a confirmation to my theory or possibly a new avenue to look down. Sorry if this is a bit of a lenghtly read, but I would rather provide too much info than not enough.
-------------------------------------------------------------
The Press:
SLC 5/05 - Press control PLC
(OS501, Series C, FRN 10)
(Hardware 552, Series C, FRN 5)
PVP 1250 - HMI
Both are connected via ethernet to a Cisco Catalyst 2960 swtich. The switch is also connected to the plants main switch for communication with the outside world.
The Transfer System:
Control Logix 5536 - Transfer PLC
PVP 1500 - HMI
Indramat PPC - Servo Motion Control Unit
3 1794-AENT - Remote IO Units
These devices are tied into a managed switch which also has a connection going the the presses Cisco switch for communication to the press and with the outside world.
-------------------------------------------------------------
Their is a message of 5 integers being sent back and forth between the press and transfer system using the MSG instruction. One of the integers is brokendown to the bit level for several status bits, including a heartbeat. The problem at hand is that most of the time, the system operates fine, but about 6 times per day the press fautls out because the heartbeat has timed out(This already has a limit of 3 seconds, which is already probably too much for the application.). I have already eliminated 3 issues which were not helping the situation. The last of which was to install the Cisco switch in the press control cabinet. This was originally a cheap Linksys hub (This only used at the time of install because the need for one was overlooked and they had it lying around in the plants server room.). After changing to the switch I noticied something odd. This switch has status lights for each port (Off means no connectivity, a fast green flash means it's running at 100mbps, and slow orange and green flash means it's running at 10mbps.). For about 8 seconds the port will show it's connected at 100mbps and then for about 2 seconds the port will show it's connected at 10mbps (This is not exact or consistant, it will sometimes switch more or less often, and for more or less time.). I have tried changing ports and patch cables to no avail. I am thinking it's the ethernet port on the SLC itself. I was hoping someone else may have come accross this problem before. Any information would be greatly appreciated. Thank You.
