MEIDEN THYFREC-VT240S - 6-11 Built-in PLC Function

6. Control Functions and Parameter Settings
6 – 185
6-11 Built-in PLC Function
The VT240S has a built-in PLC function. The sequence can be input/output and the analog signals can
be input/output with this function. The built-in PLC function has the following features.
• A programmable sequence function is provided in the inverter.
• Commands are input with a command format based on the instruction codes.
• Commands can be input from the operation panel. This allows changes to be made easily at the site.
• Commands can be input with the standard serial. Command generation support software is under
development.
6-11-1 Outline explanation of processing system
The built-in PLC function runs with the processing system shown in Fig. 6-11-1.
The interpreter section runs at a 2ms interval, so operations can be carried out at the same sample cycle
as the regular inverter process. The commands are separated in units called "banks", and one bank is
executed at a 2ms interval. The number of banks to be executed can be set with U10-0 (No. of executed
banks), so if the process is heavy, it can be split into five banks and executed at a 10ms interval.
Fig. 6-11-1 Built-in PLC processing system
Monitor
panel
Command bank
Command U20-0
.
.
.
Command U20-1
Command U20-2
Command U20-3
Command U27-4
Command U27-5
Command U27-6
Command U27-7
Command U30-0
.
.
.
Command U30-1
Command U30-2
Command U30-3
Command U37-4
Command U37-5
Command U37-6
Command U37-7
Command U40-0
.
.
.
Command U40-1
Command U40-2
Command U40-3
Command U47-4
Command U47-5
Command U47-6
Command U47-7
Command U50-0
.
.
.
Command U50-1
Command U50-2
Command U50-3
Command U57-4
Command U57-5
Command U57-6
Command U57-7
Command U60-0
.
.
.
Command U60-1
Command U60-2
Command U60-3
Command U67-4
Command U67-5
Command U67-6
Command U67-7
Command bank A Command bank B Command bank C Command bank D Command bank E
PC
(Standard serial)
Interpreter
(2ms interval)
* Execute 1 bank at 2ms interval
LD X (Load command)
ST X (Store command)
AND X (Logic operation)
ADD X (Value operation)
BIT X (bit operation)
SFTR X (Shift command)
CMP X (Condition branch)
LPF X (Time function)
LIM X (Non-linear type)
TIMER (Time function)
Accumulator
* 2WORD(32bit)
Command counter
Interpreter Memory space
Dedicated memory
(fixed with commands)
External analog memory
(input/output)
Internal analog memory
(input/output)
External sequence
memory (input/output)
Internal sequence
memory (input/output)
Panel memory
(input/output)
General-purpose memory
(for user definition)
External analog input
External analog output
Internal analog input
Internal analog output
External sequence input
External sequence output
Internal sequence input
Internal sequence output
U parameter
D parameter
Process time
addition
ERR process
when over
Command U20-0
.
.
.
Command U20-1
Command U20-2
Command U20-3
Command U27-4
Command U27-5
Command U27-6
Command U27-7