4-4
Sequencing Logic
690+ Series Frequency Inverter
External Control of the Inverter
Communications Command
When sequencing is in the Remote Comms mode, the sequencing of the Inverter is controlled by
writing to the hidden parameter COMMS COMMAND (Tag 271). This parameter can only be
written to using a communications interface. The output parameter (Tag 273) COMMS
COMMAND of the COMMS CONTROL function block is provided as a diagnostic.
The COMMS COMMAND parameter is a 16-bit word based on standard fieldbus drive profiles.
Some bits are not implemented in this release (see “Supported” column of the table below).
Bit
Name
Description
Supported Required Value
0
Switch On
OFF1 Operational
√
1
(Not) Disable Voltage
OFF2 Coast Stop
√
2
(Not) Quick Stop
OFF3 Fast Stop
√
3 Enable
Operation
√
4
Enable Ramp Output
=0 to set ramp output to zero
1
5
Enable Ramp
=0 to hold ramp
1
6
Enable Ramp Input
=0 to set ramp input to zero
1
7
Reset Fault
Reset on 0 to 1 transition
√
8
0
9
0
10
Remote
=1 to control remotely
1
11
0
12
0
13
0
14
0
15
0
Switch On
Replaces the RUN FWD, RUN REV and NOT STOP parameters of the SEQUENCING
LOGIC function block. When Set (=1) is the same as :
RUN FWD
=
TRUE
RUN REV
=
FALSE
NOT STOP
=
FALSE
When Cleared (= 0) is the same as :
RUN FWD
=
FALSE
RUN REV
=
FALSE
NOT STOP
=
FALSE
(Not) Disable Voltage
ANDed with the NOT COAST STOP parameter of the SEQUENCING LOGIC function block.
When both Set (=1) is the same as:
NOT COAST STOP
=
TRUE
When either or both Cleared (= 0) is the same as :
NOT COAST STOP
=
FALSE
