ISPSoft User Manual

ISPSoft User Manual
Additional remark
If users want to insert a comparison contact in a new network, the mouse cursor must be near the
line selected.
8.2.6 Inserting a Block Logic Instruction
If users want to take the operation result of a block as a condition of a rising edge-triggered circuit,
they traditionally have to create two networks in a ladder diagram. However, the users can combine
the two networks by means of using a block logic instruction.
The block logic instructions that ISPSoft provides are as follows.
Representation Instruction Function
NP
PN
INV
FB_NP
FB_PN
When the block preceding this block logic instruction is tuned from
OFF to ON, the output device is ON.
When the block preceding this block logic instruction is turned
form ON to OFF, the output device is ON.
The operation result of the block preceding this block logic
instruction is inverted, and the inversion result is sent.
This block logic instruction is similar to NP except that users have
to specify a device or a variable in this block logic instruction.
(FB_NP can only be used in the function blocks in AH500 series
CPU modules.)
This block logic instruction is similar to PN except that users have
to specify a device or a variable in this block logic instruction.
(FB_PN can only be used in the function blocks in AH500 series
CPU modules.)
* Please refer to AH500 Programming Manual or section 7.3.2 for more information about FB_NP and FB_PN.
Users can insert a block logic instruction in one of the two ways described below.
• Method 1
(1) Click on the toolbar, and then select a type.
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