User`s manual

DSM to PLC Interface
GFK-1742A Chapter 5 Motion Mate DSM314 to PLC Interface 5-5
5
1.07 Drive Enabled.
The
Drive Enabled
status bit indicates the state of the
Enable Drive
%Q bit
and the solid state relay output supplied by the DSM314. The ON state of the
Drive Enabled
%I
bit corresponds to the CLOSED state of the relay output and the ON state of the associated
faceplate EN LED. In Digital mode, the solid state relay provides the MCON signal to the GE
Fanuc Digital Servo through the servo command cable.
Drive Enabled
is cleared following
power-up or an error condition that stops the servo.
1.08 Program Active
.
The
Program Active
status bit for each axis indicates that a Motion
Program (1-10) or a
Move
%AQ command (27h) is executing on that axis. Executing a multi-
axis program will set the
Program Active
%I bits for both Axis 1 and Axis 2.
1.09 Moving.
The
Moving
status bit is ON when
Commanded Velocity
is non-zero, otherwise it is
OFF. All
Move
,
Jog
, and
Move at Velocity
commands will cause the
Moving
bit to be set to ON.
The
Force Digital Servo Velocity
%AQ command and Follower acceleration ramp will not set
the
Moving
bit.
In Follower mode,
Moving
is ON for the conditions described above and is not affected by the
enabled or disabled state of the follower master input. When the Follower acceleration /
deceleration ramp is active, a separate %I bit,
Follower Ramp Active,
is ON. Refer to Chapter 8,
Follower Motion, for additional information on the Follower Acceleration Ramp.
1.10 In Zone.
Operation of the
In Zone
bit depends only on the
Position Error
value and is not
related to the state of the
Moving
bit.
In Zone
will be ON whenever
Position Error
is less than or
equal to the configured
In Position Zone
value.
In Zone
(ON) can be used in combination with
the
Moving
bit (OFF) to determine when the axis has arrived at its destination.
Table 5-3.
In Zone
Bit Operation
Cmd Generator Active
(
Moving
%I bit ON)
Position Error
≤
In Position Zone
In Zone
bit
Axis at
Destination
No No OFF No
No Yes ON Yes
Yes No OFF No
Yes Yes ON No
1.11 Strobe 1 Flag, Strobe 2 Flag.
The Strobe 1 Flag and Strobe 2 Flag status bits indicate
that an OFF to ON transition has occurred at the associated faceplate Strobe Input. When this
occurs, an axis position is captured and reported in the Strobe n Position %AI status word, where
“n” is Axis 1 - Axis 4. The Strobe n Flag %I bit is cleared by the associated Reset Strobe n %Q
bit.
A maximum of 2 PLC sweeps is required for the
Strobe n Flag
%I bit to be cleared in
the PLC after a
Reset Strobe n
%Q bit is turned ON.
Once the Strobe n Flag bit is cleared,
new data may be captured by another Strobe Input. The position capture resolution is +/- 2 counts
with an additional 10 microseconds of variance for the strobe input filter delay.
Note
The Strobe n Flag bits do not indicate the logic level of the faceplate input, they
only indicate that an OFF to ON transition has occurred on the input.
1.12 Position Error Limit.
The Position Error Limit status bit is set when the absolute value of
the position error exceeds the configured Position Error Limit value. When the Position Error