WESTLOCK CONTROLS CORPORATION
280 N. MIDLAND AVE., STE. 258, SADDLE BROOK, NJ 07663 TEL: 201-794-7650 FAX: 201-794-0913
www.westlockcontrols.com
10/5/2013
TECH-477/D.W.O. 21424
Page 64 of 206
Relative
Index
Parameter Name
Description
Default
Value
Read/
Write
The behavior of a Function
Block, Physical Block or
Transducer Block is indicated
by the parameter
MODE_BLK. The
MODE_BLK elements are
coded like TARGET_MODE
and are defined as follows:
1. Actual This is the current
mode of the block, which
may differ from the
TARGET_MODE based on
operating conditions. Its
value is calculated as part of
block execution.
Under conditions which
prevent the Function Block
from operating in the target
mode, the
Function Block actual mode
will automatically change.
The actual mode will be
calculated
based on the following:
• TARGET_MODE parameter
• Mode calculation of the
block
A concept of priority is used
when the block shall
compute an actual mode that
is different from the
TARGET_MODE. Mode
priority is defined as follows,
where zero is the lowest
priority.
Mode Priority
O/S 7 ñ highest
IMan 6 (not used)
LO 5
Man 4
Auto 3
Cas 2 (not used)
RCas 1
ROut 0 ñ lowest (not used)
The state machine defining