4 Wiring with 800
4.4 Circuit diagram elements
Control Relay easy800
11/11 MN04902001Z-EN
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107
Rising edge evaluation (cycle pulse)
È
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.
Figure 89:Signal diagram of cycle pulse with rising edge
Falling edge evaluation (cycle pulse)
è
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.
Figure 90:Signal diagram of cycle pulse with negative edge
4.4.5 Markers and analog operands
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.
→
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
on
on
on
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Содержание easy800
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Страница 336: ...10 Diagnostics possibilities 10 4 Transistor output 332 Control Relay easy800 11 11 MN04902001Z EN www eaton com...