ABB IIMCP02 Multibus Communication Module SCSI

Multibus Communication Module SCSI Manufacturers ABB, Bailey Model(s)

ABB Bailey Infi 90, ABB Bailey Infi 90 and Net 90

Additional Information Bailey IIMKM02 Multibus Keyboard Module

Estimated Shipping Size Dimensions: 12.0" x 0.8" x 7.5" (30.5 cm x 1.9 cm x 19.1 cm)

Weight: 1 lbs 6.4 oz (0.6kg )

Multibus Communication Module SCSI

Basic Station

The basic station operates in either automatic (closed) or manual (open) loop control. The operator manipulates the process

by means of the faceplate pushbuttons. The station interfaces

into the customer process by different means while in automatic or manual. In manual (open loop control),

the SAC station manipulates the control output by updating the MFP

module with control output values that are written to the CIS

module that drives the analog output. The set point value can

be modified and goes to the MFP module in every station

update message but has no effect on the process.

In automatic (closed loop control), the station operator generated set point value is used by the MFP module PID algorithms

to manipulate the process. The operator cannot establish a

control output value with the output raise/lower pushbuttons

while in automatic mode.

COMPUTER LEVEL

The computer level of supervisory control is used when a PID

control loop is directly supervised and controlled by an external supervisory computer program, not an operator. When the

station is at the computer level, the operator cannot change

the station mode, control output, set point, or ratio index values via the SAC station faceplate. However, the operator can

place the station to the local level by pressing the CMPTR or

MAN pushbutton on the SAC station faceplate.

When at the computer level, the control strategies (basic, ratio

and cascade) and the station modes (manual, automatic and

cascade/ratio) operate in the same manner as they do at the

local level. The only difference is that the station variables are

controlled by the external station interface.

The station function code (function code 80) operates a computer watchdog timer that must be started by the supervisory

computer program periodically. The watchdog timer is started

when the computer program changes the station mode, a station variable while at the computer level, or when it issues a

computer OK command at either level. When a watchdog timer

time-out occurs, the station reverts back to a predetermined

computer backup state.