Hioki Super megohm SM7110 - External Control (EXT I;O)

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External Control (EXT I/O)
Be sure to read “Before controlling the instrument externally” (p. 13) beforehand.
Connecting the instrument to an external device such as a PLC (programmable logic controller)
via the EXT I/O terminal on the rear of the instrument enables you to control the instrument in the
following ways:
• Output signals from the instrument to the external device (for example, end of measurement and
judgment result signals, etc.).
• Input signals from the external device to the instrument (for example, measurement starting
signal, etc.).
All of the signals are isolated from the measurement circuit and the ground. (The ISO-COM
terminals are shared by the input and the output.)
The input circuit can be switched so as to correspond to the current sink output (NPN) or the
current source output (PNP).
To use the instrument properly, conrm the input/output ratings and the internal circuit conguration,
and understand the safety precautions before connecting cables to a control system.
Rear
Signal input/output
Check the input/output specications of the external device.
Set the NPN/PNP switch of the instrument (p. 110).
Connect the EXT I/O terminal of the instrument to the external device (p. 110).
Test I/O (signal input and output test) (p. 124)
Setting the instrument (p. 125).
9 External Control (EXT I/O)
9
External Control (EXT I/O)