Parker
Hannifin
The descriptions and parameter numbers for the EPL network are shown in
Table 72. The control parameters are those that should be set before
attempting to start the network. The status parameters are those that the
controller will set as a result of attempting to start the network. The
parameter denoted with an asterisk (*) is saved with the
ESAVE
command.
EPL Network Control Parameters
P Number
Number of Controlled Nodes (CN)*
P37376
Reserved
P37377-P37383
EPL Network Status Parameters
P Number
Network State
P37384
Non-Operating Nodes Bit Reports
P37385
EPL Operation Error Code (0 means no error)
P37386
EPLD Object OPENed (-1 means none)
P37387
OPENed EPLD Device Number
P37388
Operational Duration in Seconds
P37389
Downloading or resetting nodes bits (started)
P37390
Downloading or resetting nodes bits (current)
P37391
* Saved with the ESAVE command
Table 72 Control and Status Parameters
The value in P37385, P37390, and P37391 are a bit-oriented reports. Bit
zero represents EPLD0, bit 1 represents EPLD1, and so on. If the bit in
P37385 is set, it means that node is not operating as expected. This could be
because the node ID was not set correctly, or the node has become
disconnected, or the node simply has failed in some way.
Parameters P37390 and P37391 indicate the nodes that are the targets of
either a controlled node OS download or a controlled node reset operation.
These events are initiated by ACR-View either over the Ethernet or USB
interfaces, and ACR-View monitors these parameters during the progress of
the operation. P37390 indicates all the nodes that were or are involved, and
P37391 indicates all the nodes that have not yet finished. The progress or
final state for each individual node is reflected in a parameter in the drive
information parameters described in EPL Drive Information Parameters and
I/O Flags on page 175.
EPL Network States, LED Indications, Error Codes
Table 73 indicates the possible values for the EPL network state (P37384),
and the corresponding green states of the bicolor EPL indicator LED on the
ACR9030 and ACR9040’s EPL card. Any red in the bicolor EPL indicator
LED indicates an error state, but may co-exist with the flickering or flashing
green. The only normal steady states for the ACR9030 and ACR9040 are
“reset” and “operational.” The only normal steady states for Aries EPL are
“BASIC ETHERNET” and “OPERATIONAL.” All other states are transitional
and may not be observable, especially for a small number of nodes. All
states listed below are consistent with EPL V2.0 WSP V0.1.2 chapter 10,
“Indicators.”
Appendix H ETHERNET Powerlink 173
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