9.0 CS4 - AUTOMATIC/MANUAL STATION
9.1 CS4 - AUTOMATIC/MANUAL STATION
The Automatic/Manual Station operates as a standard auto/manual selector and a manual loader.
Automatic throughput is enabled when DI1 is closed, DI0 is closed (no Output Tracking), and A
(Auto) is selected with the A/M faceplate push button. Automatic throughput is overridden when
DI1 is open. In automatic, the signal on AI0 is passed through to the station’s output. Transfer
from automatic to manual is bumpless. Manual operation occurs when M is selected with the A/M
push button. In manual, the station output is controlled with the faceplate output push buttons.
The station’s output tracks AI3 when an open contact appears on DI0 and Output Tracking (L119)
is enabled. There is no PID control performed by the Automatic/Manual Station; however, the sta-
tion monitors an Alarmed Variable on AI2. AI2 alarmed conditions are signaled with DO0 and
DO1. A typical low-resolution display Automatic/Manual Station is illustrated in Figure 9-1.
Figure 9-1. Typical CS4 Automatic/Manual Station Application
VALVE
PUMP
FT
AI3 - TRACKING INPUT
DI0 - FORCE OUTPUT TRACKING
(OPEN CONTACT)
AI0 - AUTO INPUT
DI1 - AUTO ENABLE
(CLOSED CONTACT)
AI1 - NOT USED
AI2 - ALARMED VARIABLE
AO1 - NOT USED
DO0 - PROCESS ALARM 1
DO1 - PROCESS ALARM 2
AO0 - STATION OUTPUT
AI0 - AUTO INPUT
A
A/M
M
OPEN
CLOSED
DI0
MAN-
UAL IN-
AI3 - TRACKING INPUT
AO0 - STATION OUTPUT
(SHOWN WITH AI3 DRIVING THE OUTPUT)
(L119 = 1)
(CS4 = NO PID CONTROL)
AI2 - ALARMED VARIABLE
DO0 -
PROCESS
ALARM 1
DO1 -
PROCESS
ALARM 2
(ALARM
LIMITS
SHOWN
HIGH/LOW)
OPEN
CLOSED
DI1
Section 9. CS4 - Automatic/Manual Station
9-1
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