Auto/Manual Station; Figure 4-2 Auto/Manual Station - Honeywell UDC3500 Product Manual

4.16 Auto/Manual Station

Introduction
When you select "AM STA" (auto manual station) for one of the Digital Inputs, contact
closure on the selected Digital Input causes the controller to switch to Auto/Manual
Station mode. See Section 3.19.
Function
As shown in Figure 4-2, State 2 is the "A/M Station mode" where the programmable
logic controller (PLC) output is sent through the Auto/Manual Station. You can switch to
manual and change the output at the controller. (It uses PID set 2.)
State 1 is the "Backup PID mode" which is triggered by opening the digital input. (It uses
PID set 1.)
State 1:
DI #1: Open
BACKUP
PID
CONTROL
Aux LSP = SP1
Output
SP1 =
PIDSET1
new
selection
P =
}
I =
D =
10/05
T/C
IN1
PV
PID A
same
as
OUT1
PLC
To valve

Figure 4-2 Auto/Manual Station

UDC3500 Universal Digital Controller Product Manual
Monitoring and Operating the Controller
PV
SP
T/C
Control output
4-20 mA
IN2
State 2:
DI #1: Closed
A/M STATION
PV
– Direct action
– PD + MR
LSP = 2SP
PD+MR
– SP = 2SP
– PV = IN2
– PIDSET2
OUT1
Output 1
4-20 mA
PLC
DI #1 = "AM STA"
(new
OPEN
selection)
CLOSED
Alarm
Output on
Manual
Mode
213