Plc's For Pulse Count Function; Restriction On The Number Of Units; Terminal Connection Diagram - Mitsubishi Electric G-50A Technical Manual

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.
TG-2000A
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).
Up to 5 PLC units can
be connected to
PLC5
TG-2000A.
(Total number of watt-
hour meters is 160 at
maximum.)
PLC2
PLC1
PLC standard composition
0
1
2
F
COM
DC24V power supply
NC
QX40 Measuring
terminal instrument
board wiring
Figure 12-3 QX40 terminal connection diagram
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.)
Measuring instrument
with a pulse oscillator
Measuring instrument
with a pulse oscillator
Measuring instrument
with a pulse oscillator
79