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4.4 Function Block Specifications for EN311 Control
4
Considerations
(1) Types (1) - (3) are command classes. Class 1 is module control, Class 2 is PC link
protocol transmission, and Class 3 is socket interface transmission.
(2) For a single EN311 module, it is not possible to request another Class 1 command by
entering a start up signal to execution request (REQ) while the EN311 is executing a
Class 1 command. If such a request is issued, the command issued later will be
ignored. This is also true for class (2) CMDs.
(3) For a single EN311 module, when requesting a Class 3 command, it is not possible
to request another Class 3 command while the EN311 is executing a Class 3
command. If such a request is issued, the command issued later will be ignored.
(4) There are eight sockets, and each can independently accept and execute Class 3
commands.
(5) If the S controller switches from the run to the halt state and then back to the run
state while a command is being requested for the EN311, it is possible that the
EN311 could execute the request issued immediately prior to the halt state. This
section describes the handling required after returning to the run state.
• The S controller should always set the EN311 to standby mode using the operat-
ing mode control request after it returns to run mode.
• Enter the standby mode first, then initialize the EN311 using the reset request.
This causes all the requests issued to the EN311 to be discarded, computer link/
PC link protocol transmissions to be stopped, and the socket interface to be initial-
ized (i.e. set to the closed state).
• The same status as in the method above can be obtained by initializing the EN311
with the Reset button while the S controller is halting.
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