4 |
❏Write priority
Data can be written to another device on the Genius bus in one of two ways: via global data, or via datagrams. Only the %GQ and %GAQ data types are handled by global data writes; all other memory types are handled by datagrams.
Datagrams can be sent with either normal or high priority. Normal priority means that the C400 Controller will send the datagram only if no other datagram or similar background message has been sent by any other device on the Genius bus during the current bus scan. High priority means that the datagram will be sent when the C400 Controller has its turn on the bus, regardless of the number of datagrams and other background messages that have already been sent during the current bus scan.
Sending datagrams with high priority could adversely affect bus scan time. Also, excessive numbers of datagrams sent to a device during a single bus scan could result in some of the datagrams being ignored. Refer to the Genius™ I/O System and Communications User’s Manual
❏PV-Name internal Error Number
The Genius driver maintains specific error information for each of the possible devices on the Genius bus. A word variable from the PANELWARE Internal Connection, USERWORDnn, can optionally be specified here to obtain the specific error information for this connection. The referenced internal variable should be unique (not used in the parameter definitions of another connection) and is specified without the internal connection identifier (e.g., USERWORD01 instead of USERWORD01/DI). Refer to Appendix B for a list of error codes that could be encountered here.
❏Number of retries
Defines the number of times a read device datagram will be sent to a device following a transmission failure before the
4 - 6 | PANELWARE MMI Application Manual for GE Fanuc Genius Protocol - June 1995 |
