Publication 1762-RM001C-EN-P
ASCII Instructions 20-7
ACL - ASCII Clear
Buffers
Instruction Type: output
The ACL instruction clears the Receive and/or Transmit buffer(s). This
instruction also removes instructions from ASCII queue.
This instruction executes immediately upon the rung transitioning to a
true state. Any ASCII transmissions in progress are terminated when the
ACL instruction executes.
Entering Parameters
Enter the following parameters when programming this instruction:
•
Channel is the number of the RS-232 port, Channel 0. (For the
1764-LRP only, you can select either Channel 0 or Channel 1).
•
Receive Buffer clears the Receive buffer when set to “Yes” and
removes the Receive ASCII port control instructions (ARL and ARD)
from the ASCII queue.
•
Transmit Buffer clears the Transmit buffer when set to “Yes” and
removes the Transmit ASCII port control instructions (AWA and AWT)
from the ASCII queue.
ACL
Ascii Clear Buffers
Channel 0
Transmit Buffer Yes
Receive Buffer No
ACL
Table 20.3 Execution Time for the ACL Instruction
Controller When Instruction Is:
True False
MicroLogix 1200 clear buffers:
both 249.1
µ
s
receive 28.9
µ
s
transmit 33.6
µ
s
0.0
µ
s
MicroLogix 1500 Series B, FRN 4 or later clear buffers:
both 203.9
µ
s
receive 24.7
µ
s
transmit 29.1
µ
s
0.0
µ
s
NOTE
The ASCII queue may contain up to 16 instructions that
are waiting to run.
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