Using Temporary Relays - FATEK FBS Series Manual

1.6 Using Temporary Relays

The network de-composition method for mnemonic coding demonstrated in section 1.5 does not apply to the branched
circuit or branched block. In order to input the program using the method shown in section 1.5, It must first to store the
statuses of branched nodes in temporary relays. The program design should avoid having branched circuit or branched
block as much as possible. Please refer the next section "Program Simplification Techniques". Two situations that must use
the TR are described at below.
Branched circuit: Merge line does not exist at the right side of the branch line or there is a merge line at the right side of the
branch line but they are not in the same row.
Example： * indicates setting of TR relay
Without merge line
Although this branch has merge lines
but they are not in the same row, so this
is also a branched circuit
Branched block：The horizontal parallel blocks with a branch in one of the blocks.
Example：
Branch line
Remark 1: The OUT TR instruction must be programmed at the top of the branched point. LD TRn instruction is used
at the starting point of the circuits after second rows of the branch line for regaining the branch line status
before you can connect any element to the circuits. AND instruction must be used to connect the first
element after OUT TRn or LD TRn instruction. LD instruction is not allowed in this case.
Remark 2: A network can have up to 40 TR points and the TR number can not be used repeatedly in the same
network. It is recommended to use the numbers 1,2,3... with sequence. The TR number must be the
same in the same branch line. For example, if a branch line uses OUT TR0, then starting from row 2, LD
TR0 must be used for connection.
Remark 3: If the branch line of a branched circuit or a branched block is the origin line, then ORG or LD instructions
can be used directly and TR contact is not necessary.
Remark 4: If any one of the branched circuit rows is not connected to the output coil (there are serially connected
elements in between), and other circuits also exist after the second row, a TR instruction must be used at
the branch points.
(Users of WinProladder can skip this section)
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