Installation manual

Publication 1747-RM001G-EN-P - November 2008
SLC Status File B-47
S:33/3 Status Selection Status (Channel 0)
When set, this bit indicates that the channel 0
communication port is in the System mode (DF1 mode).
When reset, this bit indicates that channel 0 is in the User
mode (ASCII mode). Use your programming devices channel
configuration utility to change this selection.
•••
S:33/4 Status Communications Active (Channel 0)
DH-485 protocol only: This bit is set by the processor when
at least one other node is active on channel 0 DH-485
network. Otherwise the bit remains cleared.
•••
S:33/5 Dynamic Config Communications Servicing Selection (Channel 0)
When set, only one channel 0 communication request/
command will be serviced per END, TND, REF, or SVC
instruction. When clear, all serviceable incoming or
outgoing communication requests/commands will be
serviced per END, TND, REF, or SVC instruction.
One communication request/command consists of either a
channel 0 Incoming Command, channel 0 Message Reply, or
channel 0 Outgoing Message Command. Refer to Words
S:33/0, S:33/1, S:33/2, and S:33/6 for more information.
Note: When clear, your communication throughput will
increase. Your scan time will also increase if several
communication commands/requests are received in the
same scan.
To program this feature, use the Data Monitor function to
set and clear this bit. To provide protection from inadvertent
data monitor alteration of your selection, program an
unconditional OTL instruction at address S:33/5 to ensure
one request/command operation, or an unconditional OTU
instruction at address S:33/5 to ensure multiple
request/command operation. Alternately, your program may
change the state of this bit using ladder logic if your
application requires dynamic selection of this function.
•••
S:33/6 Dynamic Config Message Servicing Selection (Channel 0)
This bit is only valid when the channel 0 Comms Servicing
Selection (S:33/5) is clear (which selects service all
commands). When S:33/6 is clear and S:33/5 is clear, all
outgoing channel 0 MSG instructions will be serviced per
END, TND, SVC, or REF instruction. Otherwise, only one
outgoing channel 0 MSG command or reply will be serviced
per END, TND, SVC, or REF instruction.
•••
Table B.4 Status File Functions (Continued)
Address Classification Description Fixed
5/01
5/02 5/03 5/04 5/05