Specifications

Section 2—Modbus Plus Overview Bulletin No. VVDED397044US R12/00

Forced Local December 2000

When the logic input is not active (low), all control of the drive is

transferred to the network if wired as shown in Figures 28 or 29. The only

local (hand) controls that are still monitored by the drive controller include

the logic input assigned to Forced Local and any input assigned to a drive

stop function. Examples include:

• the stop button on the keypad display

• logic input one (LI1) which is assigned to the function STOP if the

ATV58 drive controller is configured for 3-wire control

• any logic input assigned to the functions freewheel stop, DC injection

braking, and fast stop.

See the keypad display manual VVDED397047US (latest revision) for

more details.

Communication Fault Monitoring

Word 402, bit 14 of command register CMI is used to inhibit

communication fault responses. If bit 14 = 1, the drive controller ignores

communication errors from the serial link. This function is intended for

use during troubleshooting and start-up. Do not use this function

during normal network operation.

UNINTENDED EQUIPMENT ACTION

When in forced local mode, all commands from the communication

ports are ignored.

Failure to consider the implications of unanticipated operation

can result in death, serious injury, or equipment damage.

WARNING

UNINTENDED EQUIPMENT ACTION

Loss of communication will not cause the drive controller to fault.

Failure to consider implications of unanticipated operations can

result in death, serious injury, or equipment damage.

WARNING