Precautions for Handling
Intro-10
ME0342-4B
(2) Pause Signal (*STP)
The input signal of the pause signal (*STP) is always on considering the safety. Therefore, in
general, the actuator would not operate if this signal is not on.
It is available to make this signal to “Disable”, if this signal is undesirable.
It is settable by parameter No.15 “Select enable/disable pause input”.
Refer to [6.1.2 [11] Select enable/disable pause input].
If parameter No.15 is set to “1” (Disable), the actuator can operate even if this signal is not
on.
This parameter is set to “0” (Enable) at delivery.
9. Note that there are some frictions and/or torsions in through-hole of rotary actuator when it is
used.
When using rotary actuator with a through hole in the center of the revolution and using the hole
to put cables through, have a treatment to prevent wear from rubbing or wire break due to the
cables getting twisted.
Take particular note on actuators of 360-degree specification because they can be rotated
infinitely in a single direction.
10. Limitations on operation of rotary actuator in index mode
Rotary actuators of 360° specification can select the normal mode for finite rotations or the index
mode enabling multi-rotation control by using parameter No.79 “Rotational axis mode selection”.
The following limitations are applied to the index mode:
1) In jog or inching operation using teaching tools such as PC software, etc., the one-time
command range enables a maximum of 360° in jog operation, or 1° in inching operation.
2) Pushing cannot be performed. For push torque, settings other than 0 cannot be made.
3) Do not repetitively execute positioning commands around 0 degree numerous times while
traveling in the vicinity of 0 degree. The rotation direction may switch, or operation may
become unstable.
4) Software stroke limit is disabled in index mode.
PCON-CBP/CGBP are the controllers dedicated for the pulse pressing.
Actuator model: RCP6-RRA*R-LCT (Described in the list)
Precautions for Handling
ME0342-4B Intro-11
11. Creation of sequence programs
When creating a sequence program, be careful of the following.
If exchanging data between devices with different scan time, the length of time required for a
reliable signal reading process is greater than the longer scan time. (In order to safely perform
the reading process on the PLC side, we recommend using a timer set value of at least twice
the longer scan time.)
● Operational image
As shown in the diagram, if exchanging data
between 2 devices with different scan time,
obviously the I/O timing will not match.
When the signal of this controller turns ON,
there is no guarantee that the PLC will read it
immediately.
In cases like this, in order to achieve reliable
reading, set the PLC side to read after a period
greater than the longer scan time has passed.
This also applies when the reading is
performed on the controller side.
On this occasion, make sure the safety factor of
the timer setting is 2 to 4 times or more of the
scan time.
As the timer is also processed within the
scanning process, setting below the scan time
is dangerous.
The example shown in the diagram indicates
that even if this controller performs output
process once every 1 ms, the PLC can only
recognize once every 20 ms.
The PLC only performs the output process
once every 20 ms, meaning that it keeps
recognizing the same output status for that
period.
Also, if reading is performed while the other device is rewriting output, incorrect signals may be read
at times. Wait until the rewriting is completely finished (allow interval of 2 scans or more), then
perform reading. In terms of the output-side device, do not allow its output to change until the other
device finishes the reading. Additionally, an input constant is set for the input component to prevent
mistaken detection of noise, etc. so it only accepts signals that last more than a certain period of
time. It is necessary to add this period of time as well.
This controller
(Scan time 1 ms)
PLC
(For example, scan time 20 ms)
Output
Process
Input
Process
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