Hioki IM7580, Instruction Manual

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External Control Q&A
8.4 External Control Q&A
Common Questions Solution
How do I connect an external trigger input?
Short the TRIG
― ― ― ―
input pin to an ISO_COM pin using a switch or an
open-collector output.
Which pins are the common ground for input
and output signals?
ISO_COM pins.
Are the common (signal ground) pins shared
by both inputs and outputs?
Common ground pins can be shared by both inputs and outputs.
How do I confirm if output signals have been
sent?
Check the voltage waveforms with a memory HiCORDER and
oscilloscope.
To do this, voltage level has to be confirmed by pulling up the output
signals of EOM
―――
and the comparator judgment result (through several
k
Ω
) to the power supply.
How do I troubleshoot input (control) signal
issues?
For example, if triggering does not operate properly, bypass PLC
control and short the TRIG
― ― ― ―
pin directly to an ISO_COM pin.
Take sufficient care not to short the power supply.
Are the comparator decision signals (HI, IN
and LO) retained during measurement (or do
they turn OFF)?
They are set at the end of measurement during initial settings and
turned OFF once measurement starts.
However, it is possible to change the settings so that the previous
judgment results are also stored during measurement.
See “8.6.3 Setting Reset of Judgment Results (Judgment Result
Signal Reset)” (p. 217).
When are measurement error signals
displayed?
An error is displayed in the following cases.
• Measurement error
• Contact error
• HIGH-Z reject error
• Detection level error
Are connectors and flat cables required for
connection provided?
Connectors and cables are not supplied, these have to be arranged
by the customer.
Is a direct connection to the PLC possible?
Direct connection is supported for relay and open-collector outputs,
and positive-ground optocoupler inputs. (Confirm that voltage and
current ratings will not be exceeded before connecting.)
Can external I/O be used at the same time
as RS-232C or other communications?
It is possible to control measurement with a TRIG
― ― ― ―
signal while
acquiring measurement data via a communications interface after
setting up measurement conditions with the communications
interface.
How should external power supply be
connected?
The external I/O input and output signals of this instrument operate
from an internal isolated power source of this instrument. Therefore,
power supply from PLC is not required.
8.5 Measurement Using a Computer
You can control this instrument with communication commands from a computer via the USB, GP-IB, RS-
232C, LAN interfaces.
To enable communication, the communication conditions need to be set on the instrument.
Refer to “10.1 Setting the Interface” (p. 231) for details on the communication condition settings.
Refer to the supplied Communication Instruction Manual (LCR Application Disk) for the details on the
communication control procedure.