Manual

Command Initiation, Execution, and
Monitoring
Chapter 7
7-10
Figure 7.5
Timer-Initiated Command
033
12
Remote Fault
033
02
Local Fault
U
032
12
032
02
Done
Start
TON
046
1.0
032
02
/
Done
L
032
12
046
15
Timed Bit
Start
PR 010
AC 000
In this example, timed bit 04615 is used to initiate the command at every
preset interval, 10 seconds. This bit is examined to LATCH the START
bit. The DONE, LOCAL FAULT, and REMOTE FAULT bit are
examined in parallel branches to UNLATCH the START bit.
In normal operation, after the command is executed, the DONE bit is set
ON by the communication adapter module. This causes the program to
UNLATCH the START bit. The timer then begins timing again once the
DONE bit is set OFF. (As Figure 7.1 shows, the DONE bit is reset only
after the START bit is reset.)
Note that this programming causes continuous re-try of a command in the
event of faulted operation.
When it cannot execute a command, the Communication adapter module
sets a REMOTE or LOCAL FAULT bit ON. These bits, in the data table
of the station processor, are located in the word immediately following the
START/DONE bit word. They indicate not only that a command was not
REMOTE/LOCAL FAULT Bit
Monitoring