PCC-IV Instruction Manual (Rev. 0.1)
Page 6-35
Section 6
– Blockware Functions
Technical Reference
F93
[DCON] Discrete Constant
Function
CON
outputs a user defined discrete constant. This value can be changed via: the PCC-IV Browse Blocks
menus (under password protection), via USB Blockware download, or via the MODBUS communications link. This
value cannot be changed from the PCC-IV front panel Operator displays during normal operation.
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NAME: DCON SINGLE USE FUNCTION: N OUTPUT TYPE: D
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Input Type Description Notes
_____________________________________________________________________________________________
NONE
Parameter Description Default Max Min Code Notes
_____________________________________________________________________________________________
1 DISCRETE CONSTANT VALUE 0 1 0 2
F96
[PANEL] Front Panel Display
The front
PANEL
is the Operator's interface to the PCC-IV Blockware logic. The Blockware designer uses the
Panel
Data Screen
to determine the Blockware variables that the Operator can view, the variables the Operator can
modify, and the alarms to be annunciated. See Section 5 for more information. The
PANEL
Block Output is
controlled by the "Annunciator Logic" (see below).
See Section 3 for normal operation of the Front Panel. See Section 4 for operating the Menu System.
Annunciator Logic: The Alarm Channel Settings in the
Panel Data Screen
determine which Tags will be
Annunciated. The first scan that an alarm Input changes from a "0" to a "1" (i.e., on the rising edge), the matching
alarm channel message is stored at the end of the sequential memory stack with a time/date stamp. If an alarm
clears and re-alarms before the alarm message is viewed (i.e. acknowledged), annunciator will NOT put a second
copy of the same message on the stack.
When Input 2 (Annunciator Enable) equals "1", the annunciator functions normally. When the Annunciator Enable
Input equal "0" (the default Input), no new alarms are stored in the stack. However, all existing alarms on the stack
remain until cleared and acknowledged. Annunciator Enable can be used to prevent nuisance alarms during
process startup or shutdown.
When a new alarm occurs, the
PANEL
Block Output changes to a "1", The ALARM LED starts flashing, and
optionally (section 5) the bargraphs start flashing. Typically, the
PANEL
Block Output is connected to a
ROUT
,
DOUT
, or
TOUT
Block, and then physically wired to an external audible alarm. Press ACK, or change Input 1
(Remote Alarm Silence) from a "0" to a "1" to silence an alarm, to change
PANEL
's Block Output back to "0", and
to stop the optional bargraph flashing. See Section 3 for further details.
Note: If there are multiple PCC-IV's, all the configured alarm horn outputs can be wired in parallel to a single audible
alarm. A single external Alarm Silence pushbutton can then be wired in parallel to a
DIN
on each PCC-IV.
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NAME: PANEL SINGLE USE FUNCTION: Y OUTPUT TYPE: D
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Input Type Description Notes
_____________________________________________________________________________________________
1 D RMT ALM SILENCE BLOCK 1
2 D ANNUCIATOR ENABLE BLOCK 1
No Parameters
