Markers And Analog Operands - Eaton easy800 Manual

4.4.5 Markers and analog operands

Rising edge evaluation (cycle pulse)
This function is used if the coil is only meant to switch on a rising edge.
When the coil status changes from 0 to 1, the coil switches its make
contacts to 1 for one cycle.
on
on
Figure 89:Signal diagram of cycle pulse with rising edge
Falling edge evaluation (cycle pulse)
This function is used if the coil is only meant to switch on a falling edge.
When the coil status drops out from 1 to 0, the coil switches its make
contacts to 1 for one cycle.
on
on
Figure 90:Signal diagram of cycle pulse with negative edge
￫
A set coil is automatically switched off in the event of a power
failure and in STOP mode. Notes: Retentive coils keep their
logic state (￫ section 8.2.6, "Retentive data storage", page
308).
The term "marker" is used to represent marker bits (M). Marker bits (M) are
used to store the Boolean states 0 or 1. A marker bit is also called an auxiliary
relay.
easy800 devices also manage the marker bits in marker bytes (MB), marker
words (MW) and in marker double words (MD). A marker byte consists of
8 marker bits, a marker word of 16 marker bits and a marker double word of
32 marker bits.
To store the state of a contact, you can use a specific bit and thus also a
specific byte. For example, marker bit 9 is contained in marker byte 2, in
marker word 1 and in marker double word 1. The following conversion tables
will help you to determine the word in which a bit is contained or the bits of a
specific double word.
Bear in mind that after the division, a rounding up to the next higher integer is
necessary, even if the decimal number is below 0.5.
Control Relay easy800 11/11 MN04902001Z-EN www.eaton.com
4 Wiring with 800
4.4 Circuit diagram elements
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