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5.5 External Control Q&A
86
5.5 External Control Q&A
Common Questions Answers
How do I connect external trigger input?
Short-circuit the the TRIG pin and the ISO_CO pin with a switch or
open collector output.
Which pins are common ground for input and
output signals?
The ISO_COM pins.
Are the common (signal ground) pins shared
by both inputs and outputs?
Both common ground pins can be shared by inputs and outputs.
How do I confirm output signals?
Confirm voltage waveforms with an oscilloscope. To do this, the out-
put pins such as EOM and comparator decision outputs need to be
pulled up (through several k

).
How do I troubleshoot input (control) signal
issues?
For example, if triggering does not operate properly, bypass the
PLC and short-circuit the TRIG pin directly to an ISO_COM pin. Be
careful to avoid power shorts.
Are the comparator decision signals (
HI
,
IN
,
LO
) retained duri150
ng measurement (or can they be off)?
The state is determined at the end of measurement, and is off once
at the start of measurement.
Why would the
EOM
signal not be detected?
Try using the Pulse setting for EOM output.
When the measurement time is short and EOM output is set to
Hold, the time to de-assert may be too short to be detected by the
PLC. When the EOM output is set to Pulse, the signal is asserted
(ON) for the specified pulse width before turning off.
What situations cause measurement faults to
occur?
An error is displayed in the following cases:
• A probe is not connected
• A contact is unstable
• A probe or measurement object is dirty or corroded
• Measurement object resistance is much higher than the measure-
ment range
Is a connector or flat cable for connection pro-
vided? A solder-type connector is supplied. The cable must be prepared at
the user's side.
Is direct connection to a PLC possible?
Direct connection is supported for relay or open-collector outputs
and positive-ground optocoupler inputs. (Before connecting, confirm
that voltage and current ratings will not be exceeded.)
Can external I/O be used at the same time as
RS-232C or other communications?
After setting up communications, it is possible to control measure-
ment with the TRIG signal while acquiring measurement data via a
communications interface.
How should external power be connected?
The instrument's external I/O input and output signals all operate
from an internal isolated power source, so power must not be sup-
plied from the PLC side.
Can the measured values be acquired using a
footswitch during the free-run operation? Please use the free software for acquiring measured values avail-
able for download from our website.
HIOKI BT3564A961-02