INTRODUCTION
HARDWARE APPLICATION
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I-E96-117B
®
The front panel pushbuttons:
•
Select the alphanumeric display mode.
•
Select the station operational mode.
•
Raise/lower set point and control output (demand output).
•
Select manual override.
•
Acknowledge the alarms.
HARDWARE APPLICATION
The SAC station enables monitoring a process or controlling a
process manually. One NTCS04 Control I/O Termination Unit
or an NICS01 Control I/O Termination Module with an NIDS01
Station Termination Module can interconnect up to eight sta-
tions (two chains with four stations per chain). Multiple termi-
nation devices may be interconnected together in order to
interface the desired number of stations. In an interconnecting
arrangement, the first station can have bypass capability.
Bypass allows direct control of the final control element (four to
20-milliamp output or electric drive). IMMFP01 and IMMFP02
Multi-Function Processors with firmware revision level higher
than C_0, or IMMFP03
1
Multi-Function Processors with any
revision level can interface a maximum of 64 stations. Figure
shows an example of SAC stations within the INFI 90
hierarchy.
1. . Other modules include the IMMFC03, IMMFC04 and IMMFC05 Multi-Function Controller Modules, the IMCOM03 and
IMCOM04 Controller Modules and the IMQRC01 Quick Response Controller Module. Their functionality within the control sys-
tem is similar to the MFP module except that each module varies in control capabilities (operating specifications).
FEATURES
Low cost and compact size make the analog control station a
convenient way to add stations that have operator interface
capabilities. The maximum allowable number of stations is 64
when using an IMMFP01 or IMMFP02 module (firmware revi-
sion level C or higher and operating at 40 kilobaud) unless
used in conjunction with an NDIS01 digital indicator station.
All other applications allow a maximum of eight stations.
The SAC station operates in three modes depending on module
configuration: Basic, cascade, or ratio. The control strategies
for each station type reside in the module.
Selectable station options allow a standard current output
(four to 20 milliamps) or contact relay outputs for electric
drives when the station enters bypass operation or manual
override. Additional option selections include:
•
Faceplate display format for each mode of operation.
