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5
Precautions when Using Input Signals
The input circuit of the DI-16H2 can receive the output from a relay contact and transistor (open
collector). Take the following precautions.
6
External terminals
6.1
Functions
The DI-16H2 is equipped with external terminals TB1 (11 poles) and TB2 (8 poles) for connect-
ing peripheral devices, so that digital signals [16 bit binary / 4 digit* BCD signed signal, SET
(read) signal] can be input.
Table 1 provides the signal allocation for each terminal.
Due to a change in external terminal placement, some external terminal names were changed. TC2 was
IMPORTANT
changed to TB1, and TC1 was changed to TB2. In addition, connection point for control signals were
changed from the conventional DI-16H2.
Before wiring each control, refer to "4.2 Connecting the Inverter, Option Card, and Peripherals",
"Table 1 External Terminal Functions of the DI-16H2 " and to "9 Precautions on Replacing DI-
16H2".
• If using relay contacts as digital reference signals, use high-integrity relay contacts with
a weak current of 100 mA or more and a capacity of 30 VDC.
• If using transistors (open collectors), use transistors with a withstand voltage of 35 VDC
or more and a rated current of 30 mA or more.
15
5 Precautions when Using Input Signals
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