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12.
Step 9: Determining Number of PLC Units
This chapter talks about how to determine the number of sequencers (PLC).
12.1 PLC Standard Configuration
G-50A uses PLC (Programmable Logic controller) to provide measuring instrument charging function
(pulse count system), general-purpose control function and other functions. The PLC to be used is
“MELSEC-Q series” by Mitsubishi Electric, and Figure 12-1 shows the standard configuration of G-50A
system.
In the standard configuration, “power supply unit”, “CPU Unit”, “Ethernet Unit” are mounted in the slots
above the base unit.
Two open slots should be mounted with boards (DC input unit and transistor output unit) necessary to
realize various functions. Model names of MELSEC-Q series products are listed in the Table 12-1 below.
Table 12-1 MELSEC-Q series name and model name
Name
Sequencer
MELSEC-Q series
Type of unit
CPU unit
Power supply unit
Ethernet unit
Base unit
DC input unit
(extension)
Transistor output unit
(extension)
Model names (Makers)
Q02CPU (Mitsubishi Electric)
Q61P-A1 (Mitsubishi Electric)
Q71E71-100 (Mitsubishi Electric)
Q33B (Mitsubishi Electric)
QX40 (Mitsubishi Electric)
QY40P (Mitsubishi Electric)
Detail
Mandatory
Software needed to perform various functions
(ATA card should be inserted.)
Mandatory
AC100V only (Select Q61P-A2 for a single-phase
200V application.)
Mandatory
Mandatory
One unit can accommodate 16 contact input.
This is non-voltage input.
One unit can accommodate 16 contact input.
This is non-voltage output.
Base unit
Power supply unit
CPU unit
Ethernet Unit
Open port 1
Open port 2
Figure 12-1 PLC standard composition