C
hapter
Ⅳ
P
rogramming on
FAB
panel
55
4.4.2 Intermediate relay
During the programming, the intermediate relay is a very important part which
acts like a bridge. The intermediate relay of a FAB is similar to that in the relay
control system. They can store some intermediate status and then transfer it to a
block requiring this status for input. Use of intermediate relays has two advan-
tages:
1. The output terminal of the previous block can be used as the input signal for
other different blocks;
2. When a block is inserted or deleted, the original logical relation can be re-
tained. The basic functions of the intermediate relay are as shown in the follow-
ing gure:
Fig. 4.23
In the above gure, the output status of B01 may not only be used directly as
the input of B02 block, but also be stored by M01 and then used as the input of
B03.
4.4.3 Edit program
Take the stair lighting system for an example, the control requirements are
listed as follows:
1. When the switch button is pressed, the light will be turned on and normally
keeps this state;
11
12
M01
M01
B01
B02
B03
13
14
15
Q1
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