6-34
This connection method is used when
connecting two or more slave units in a
master/slave connection.
The description in (1) above applies
between the master and the first slave unit,
but function code E29 must be set
between the first and second slave units.
This setting is needed so that pulse train
commands from the master are passed as
pulse train signals to slave 2 without
being subject to software processing by
slave 1.
Table 6.2.11
Function
code
Name Setting
E29
PG pulse
output
selection
9: PG (PR)
Generates open collector
output for position
command pulse input
without other
modification.
(3) Pulse transmitter
• In pulse train operation using a pulse transmitter, the number of slave units that can be connected is determined
by the transmitter's current capacity (8 mA sink current/circuit).
• When the direction of rotation for slave motors will be opposite that of the master, the direction is determined
by the [IVS] contact and the pulse input format. Set function code o13 (pulse train input format selection)
according to the pulse format.
This technique drives the master FRENIC-VG with pulse commands using a
PLC or other pulse transmitter.
As illustrated below, the maximum number of units connectable is
determined by the current capacity of the master pulse transmitter.
Table 6.2.12
Master pulse transmitter
Slave OPC-VG1-PGo
[PA], [PB], and [CM]
terminals
Current capacity per
circuit
8 mA max. per circuit
16 mA or greater 2 units
24 mA or greater 3 units
x mA or greater Whole number of
units given by (x / 8)
Figure 6.2.26
Figure 6.2.27
The number of slave units depends on the transmitter’s drive current capacity.
Master
OPC-VG7-PGo
Slave 1
FA and FB terminal open
collector output
Slave 2
FA and FB terminal open
collector output
OPC-VG7-PGo
FRENIC-VG
1500
FRENIC-VG
1500
FRENIC-VG
1500
Pulse transmitter
(PLC, etc.)
FRENIC-VG
1500
FRENIC-VG
1500
FRENIC-VG
1500
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