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VISUAL SUPERVISOR TUTORIAL/USER GUIDE 3.2.3 Using GROUP block channels to organise the preplot display An important function of the GROUP block’s Chan1 to Chan16 parameters is to organise setpoints for display in the Instrument’s preplot view, via DR_ANCHP and DR_DGCHP recorder channel blocks. Figure 3-2 shows a preplot display with one digital and two analogue setpoints. Note Zoning has been used to confine the three setpoints to their own horizontal (in this case) bands on the ‘chart’. Table 3-2 gave you the zone specifications for the current setpoint program application. You will see what effect this has later in the tutorial. ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ Analog SP1 ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ FUTURE ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ Analog SP2 ○ NOW ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ Digital SP1 ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ PAST ‘Chart’ Motion Figure 3-2 Example Instrument ‘preplot’ display For a valid preplot display, the GROUP block channels must be associated in strict numerical order with the setpoints generated by the running setpoint program — which you will create in the next section. This is done as follows: 1 First, the analogue PVs must be associated in numerical order as defined by the setpoint program. That is, Analogue PV1 (resulting from Analogue Setpoint 1) must be associated with Chan1, Analogue PV2 with Chan2, etc., until all the analogue PVs have been dealt with. 2 Then, any digital setpoints must be associated in program order with the next of the GROUP block’s channels. 3 In the ‘preplot’ group there is only one analogue PV resulting from the single analogue setpoint generated by the setpoint program. So the DR_ANCHP block PV_prog is allocated to the ‘preplot’ GROUP block’s Chan1 field. The ‘preplot’ group has one digital setpoint. So the DR_DGCHP block stirrer is allocated to the ‘preplot’ GROUP block’s Chan2 field. When all the analogue PVs and digitals have been dealt with, the analogue SPs are associated with the remaining channels in order. Chapter 3 Page 3 - 6 In the ‘preplot’ group, the DR_ANCHP block SP_prog is therefore associated with Chan3 to complete the set. HA029587 Issue 1 Jul 07
