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12.2 PLC’s for Pulse Count Function
12.2.1 Restriction on the number of units
To carry out measuring instrument charging function or energy saving peak cut control, you will need to
have the standard configuration explained in the previous chapter plus a DC input unit.
One DC input unit can support 16 contacts, so you can connect up to 16 measuring instruments. Since
one PLC has two open ports, you can connect 32 watt-hour meters to 2 DC input units. In case 33 or more
watt-hour meters have to be connected, add one more PLC unit.
PLC standard composition
PLC5
PLC2
PLC1
TG-2000A
Up to 5 PLC units can
be connected to
TG-2000A.
(Total number of watt-
hour meters is 160 at
maximum.)
Up to 16 watt-hour meters can
be connected to 1 DC input unit.
2 DC input units can be connected
to 1 PLC unit. (Total number of watt-
hour meters is 32 at maximum.)
Figure 12-2 Restriction on the number of PLC units for the electric power apportioned charge function
12.2.2 Terminal connection diagram
Connection to DC input unit (QX40) terminals is shown in the Figure 12-3.
Since DC input unit is non-voltage input, you need to prepare an external DC24V power supply (DC12V is
cannot be used).
Measuring
instrument
wiring
Measuring instrument
with a pulse oscillator
Measuring instrument
with a pulse oscillator
Measuring instrument
with a pulse oscillator
DC24V power supply
QX40
terminal
board
0
1
2
F
COM
NC
...
Figure 12-3 QX40 terminal connection diagram