Emerson KJ2003X1-BB1 12P3439X012 incremental MD Plus controller

Description

SLIM auto mode corresponds to Valve Positioner normal mode. In this mode, the

Controller is writing its desired position to the KJ2003X1-BB1 Valve Positioner. In normal mode,

the valves’ position and set point can be viewed on the SLIM, but the SLIM has no

control over the Valve Positioner.

These modes should not be confused with auto and manual modes of software loops

within the Controller. The important thing to remember is that the Valve Positioner

is always in normal mode, receiving its position from the Controller, unless the

Controller fails, in which case the Valve KJ2003X1-BB1 Positioner switches to local mode.

When raise and lower on the SLIM are pressed, all Valve Positioners respond to the

key action. This means that all valves will move together as a group. It also suggests

that no other devices (Loop Interfaces) should be connected on the serial bus with

a group of Valve Positioners.

In abnormal situations, such as during maintenance, some valves may be in normal

mode, and some may be in local mode. In this situation the valve in local mode will

respond to raise/lower action, but the valves in normal mode will not. The

Controller application will warn or notify the operator of the mode of each valve.

Since the SLIM will be connected KJ2003X1-BB1 to a group of Valve Positioners, each Valve

Positioner must control its own transmit enable. Each SLIM enables its transmitter

when placing a response into the transmit buffer. It also starts a 25 mSec timer,

which, when expired, disables the transmitter.

Each Personality module has a simplifified wiring diagram label on its side, which

appears above the terminal block. This KJ2003X1-BB1 diagram indicates how the wiring from the

fifield is to be connected to the terminal block in the base unit. The diagram for the

Valve Positioner Personality module is shown in Figure 25-4.

The following table lists and defifines the abbreviations used in this diagram.

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