Operating Modes; Powerup Sequence - GE 90*-30 PLC Series User Manual

2

Operating Modes

Powerup Sequence

2-4
The LBIM has four modes of operation:
Unconfigured This is how the LBIM is shipped from the factory. Four default network
variables are set up to allow the network interface to be configured over
the L
L
ON
SNVT_obj_request, SNVT_obj_status, SNVT_file_req, SNVT_file_status.
This mode is also entered if the network interface configuration
information is corrupted or if an invalid configuration is loaded to the
LBIM.
Unbound This mode exists after the LBIM's network interface has been configured,
but before network variables are bound. The LBIM presents self
documentation information to the network (in response to queries) and can
be configured in the PLC backplane. Network variables are not updated
across the network.
Normal Operation If one or more network variables are bound to other L
data updated by the PLC will be sent across the network to the other node.
Input network variables for the module can also be updated (and the data
sent to the PLC) if the network variables are bound.
Software Download If the boot loader is used to update the software, the LBIM does not
respond to the network or the PLC interface. The LBIM should be put off-
line before downloading new code.
The self-test sequence performed by the LBIM during powerup is illustrated in Figure 2-2.
The default network interface configuration consists of the LonMark node object with four
network variables (index 0—3).
•
SNVT_obj_request
•
SNVT_obj_status
•
SNVT_file_req
•
SNVT_file_status
Series 90™-30 PLC LONWORKS® Bus Interface Module User's Manual – June 1997
W Network. These network variables are part of the
ON ORKS
M node object that has the four network variables (index 0—3):
ARK
Object request
Object status
File request
File status
W nodes,
ON ORKS
GFK-1322A