Function Blocks - Mitsubishi Electric a2 Series Programming Manual

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2 Simple Application Controllers
6.

Function Blocks

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The 2 series controller is fundamentally based on function block programming. The blocks
provide a wide range of possible operations and have been preprogrammed for ease of use.
Some Function Blocks have parameters that can be tailored to meet individual requirements in
the programs. Each function block will have a description of the Block's purpose, a diagram of
how the Block will appear on-screen, and a description of the inputs, outputs, and available
options.
Table 6.1: Function Block List
FB Name
Boolean
[BL]
Set/Reset
[SR]
Pulse
[PL]
Alternate
[AL]
Delay
[DL]
One Shot
[OS]
Flicker
[FL]
FB Symbol Description of Function Block
The Boolean Function Block uses Boolean
1 0 0 0
algebra to control the ON/OFF state of an
2 P O
output. An operational expression consists
3
of either the AND, OR, NOR, XOR or NOT
B L
4
form.
The Set/Reset Function Block either holds
0 0 0
an output ON (set) or releases the output
S P O
OFF (reset.) Priority can be given to either
R
input pin if both inputs have been energised
S R
simultaneously. The default priority setting
is dedicated to the reset input pin.
The Pulse Function Block sends a single
0 0 0
pulse to the output pin if the input pin
I P O
receives either an "ON to OFF", "OFF to
ON" or "ON to OFF And OFF to ON" input
P L
operation.
The Alternate Function Block is used to
0 0 0
reverse the ON and OFF state of the output
I O
as and when the input pin receives a signal.
C
The output will be set ON when the input
A L
pin goes high and remain ON until the input
receives the second rising edge.
0 0 0 The Delay Function Block provides an ON
delay timer and an OFF delay timer. Time
I P O
intervals for either situation can be set. The
C
time unit can be set to 10ms, 100ms or 1s
D L
increments.
The One Shot Function Block awaits a
signal supplied to the input pin thereafter
0 0 0
setting the output according to the specified
I P O
time. The timing parameters control the
C
state of the output (depending on the
O S
priority setting). The time unit can be set to
10ms, 100ms or 1s increments.
0 0 0
The Flicker Function Block changes the ON
I P O
and OFF state of the output according to a
preset flicker time. The time unit can be set
F L
to 10ms, 100ms or 1s increments.
Function Blocks 6
Memory
Section
Use
*1 6.3
14 Byte 6.4
10 Byte 6.5
13 Byte 6.6
19 Byte 6.7
17 Byte 6.8
19 Byte 6.9
6 - 1