Marathon Computer UNIPRO V3.5 - Manual (Page 151)

MMI Product Documentation
Unipro 3.5 Process Control 1 Aug. 1997
Limit Statements
There are various ways to force a program to wait for
something to happen. Although it may seem that the specified
condition should be easily satisfied, it is still wise to put
realistic time limits on how long the wait should be.
The following chart summarizes the effect the LIMIT
statement has on each OPCODE.
Effect of Limit Statement on OPCODES
OPCODE Effect of Limit Statement
A Effective with alarm
codes 80 and 81. An 80 or 81 --
limit statement sets deviation band
in degrees, decimal point is
ignored (i.e. 1.00 is 100 degrees)
b
No Effect*
C No Effect*
d No Effect*
E No effect on event
output. On event input, sets the
maximum amount of time to wait
for that event to occur. An alarm
93 is displayed or sounded.**
G
No Effect*
H Forces a wait and
sets the maximum amount of time
to wait for the temperature to
reach setpoint +10 F(+5 C).**
h
Sets maximum time
to wait for a condition to be met.**
I
No Effect*
J No Effect*
L No Effect*
n No Effect*