Table of Contents
Advertisement
Contact
Operate
Function
latching
Relay
I
R-2
~~~~~
____________
Q)_I~~----~r-
____
-+ ____
~
__ +-__
~
17121 Process
o
Circled numbers refer to text
Figure 10. Contact Operate Logic
Contact Operate Programming
The Contact Operate instruction Select Address and
Contact Operate initiates a contact closure of 50 ms.
The Multiplexer Busy indicator is on during this time.
If the multiplexer is busy when the Select Address and
Contact Operate instruction is initiated, the instruc-
tion is delayed until the Multiplexer Busy indicator
goes off. The computer is disconnected 160
fLsec
after
initiating the instruction. 1£ the computer is discon-
nected before an instruction using the multiplexer is
initiated and before completion of the 50 ms interval,
the instruction is delayed for the remainder of the 50
~~
Controlling
I
Actuators
~I
Process
1
Instrumentation
1
+
I
Set-Point
I
Positioners
Process Area
-
-
-
-
Control System
I
Analog
Contact
1712 MTU
Output
Operate
I
1711
t
1
1620
Figure 11. On-Line, Closed-Loop Control
ms. 1£ the Input/Output Interrupts special feature is
installed, a Multiplex Complete Interrupt signal occurs
after the 50-ms interval.
Analog Output
The Analog Output feature enables process engineers
to "close the loop" with the
IBM
1710 Control System.
Process instrumentation provides data to the computer
which, after programmed analysis of the collected data,
returns controlling signals to the process via the Analog
Output and Contact Operate features (Figure 11) . All
Measuring
Instruments
-
-
High-Speed
Analog
I
Contact Sense
Input
ADC
I
19
Advertisement
Table of Contents
