6. Function blocks
6.1 Manufacturer function blocks
Example: Shift register BIT mode, forward
Figure 171: Shift register SR..: Forwards operation in BIT operating mode
Initial situation
– SR..EN is not activated, the function block is not active.
– SR..Q7 contains a data bit 1, a 0 is contained in the other register fields.
Transfer of a data bit
– SR..EN is activated, the function block is active.
– SR..FD has the value 1.
– With the forwards pulse from SR..FP the register field SR..Q1 shifts the content of all
register fields one place forwards and accepts the 1 from SR..FD.
Transfer of a data bit
– SR..EN is activated, the function block is active.
– SR..FD has the value 0.
– With the forwards pulse from SR..FP the register field SR..Q1 shifts the content of all
register fields one place forwards and accepts the 0 from SR..FD.
Reset of the register
– SR..EN is activated, the function block is active.
– Activating SR..RE clears the content of the register.
SR function block - shift register (DWORD)
A rising edge at FP (ForwardPulse) causes the double word value at data input I1 to be
transferred to the first register field D1. The original contents of the register fields are
then moved by one field in the direction of the next higher field numbers. A rising edge
at the BP (BackwardPulse) transfers the double word value at data input I2 to the last
register field D8. The original contents of the register fields are then moved by one field
in the direction of the next lower field numbers.
easyE4 11/18 MN050009 EN www.eaton.com
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