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Reference Manual
00809-0100-4696, Rev AA
September 2004
Rosemount 848L
3-14
EQ - Channels 17-32 are set by the result of an equation specified by up to 80
characters and stored in parameter EQx, where x is the equation number. The
equation results are available as a discrete value and status in parameter
EQx_VALUE. They may be referenced by the EQ (u) function. The range of
‘u’ is 1 to 16. These are intended to be intermediate values that are used
because the value is used in other equations or because the equation text
was too long. A configured DI block may use an equation channel (range 17
to 36) in order to make the result available to other devices.
OUT – The value will be the same as the requested output.
Additional Channels
The ten channels that are used for connecting multiple in or out function
blocks can not be referred to by equation functions. Each has a status that is
Bad if any Input status is Bad. Channels 37 to 41 pack the values into one
byte so that a DI or DO function block can read or write them. Any block linked
to a DI block with packed data must be capable of handling the packed
boolean values. Channels 42 to 46 may be used with standard MDI or MDO
blocks.
Reading a channel value will reset all of the channel latches that are
configured. Channels 38 and 43 do not have latches. If a DI and a MDI are
both used they will interfere with the latches, but the user is expected to use
one or the other, never both.
Channel Type FB
37 All IN DI
38 All DO DO
39 First 8 EQ DI
40 Last 8 EQ DI
41 All OUT DO
42 All IN MDI
43 All DO MDO
44 First 8 EQ MDI
45 Last 8 EQ MDI
46 All Out MDO