Components Of Function Blocks; Figure 3-11 Alarm 1 Function Block Components - Honeywell VPR100 User Manual

Programming and Operating Concepts

3.9 Components of function blocks

The three components of a function block are:
•
Input parameter(s)
•
Function block parameter(s)
•
Output parameter(s).
Figure 3-11 shows the function block Alarm #1's components.
Fu nc ti o n bl oc k p ar am e te r
Fu nc ti o n bl oc k p ar am e te r
In pu t p ar am e te r
In pu t p ar am e te r
In pu t p ar am e te r
Fu nc ti o n bl oc k p ar am e te r
Fu nc ti o n bl oc k p ar am e te r
Input parameter
A function block's input parameter can be configured to be OFF, a number, or it can receive its data from
outside the block from another block's output codes. These output codes are shown in Table 3-5. That is,
an input parameter is any menu item that can be programmed as (connected to) one of these output codes.
These output codes are grouped under the menu choice PARM. When you are programming a function
block and one of your choices is PARM, you know you are programming an input parameter. See Figure 3-
11.
For example, suppose you are programming an alarm function block. One of the alarm's menu items is
INPUT, which specifies which point will be monitored for an alarm condition. One of the choices for the
INPUT is PARM, which lets you connect the INPUT to one of the output codes in Table 3-5. Therefore,
the INPUT is an input parameter because it receives its data from another function block.
Some function blocks can have multiple input parameters. For example, an Alarm function block has an
INPUT and a SETPOINT, both of which can be connected to other function blocks.
Discrete Input function blocks have no input parameters; that is, they have no inputs that can be connected
to another block's output codes.
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Al a rm 1 Func ti on Bl oc k
AL AR M AC TI ON ( Se le ct H ig h, L ow, De v , LR at e, H Ra te )
IN D EC I MAL PO S ( Se le c t in pu t d ec i ma l po s it io n)
IN PU T (S el ec t O FF , Nu mb e r, o r PA RM)
SE TPOI N T (S e le ct OF F, Nu mb e r or PARM)
CO MP AR E POI NT (Sel ec t O FF , N um be r, or P AR M)
HY STER ESIS ( S el ec t OF F o r Nu mb er )
DE LAY TI ME (S el ec t O FF o r N um be r)

Figure 3-11 Alarm 1 Function Block Components

VPR & VRX – User Manual
Ou tp ut pa ra m et er s
AL 1 OS ( Al ar m s ta te )
AL 1 S 2 (C o mp ar e po in t o f
De v i ati on al ar m o nly )
AL 1 PV (Va lu e of a l ar m' s IN P UT)
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