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Chapter 5
* #$"&#&!'
5-9
This section defines the MSG functions that process unsolicited messages
from a PLC-5 programmable controller. See Appendix B, Application
Program Interface Routines, for more information.
Read/Write MSG Functions
Use read/write MSG functions to process unsolicited MSG instructions
from a PLC-5 ladder-logic program. See Table 5.G.
Table 5.G
ControlĆCoprocessor MSG Read/Write Processing Functions
Function What It Does Why You Need It When You Use It

&#''' " )"'# ( .
 & "'(&)(#"
# $&#&! '-"&#"#)'
$&#''" # " )"'# (
.  & "'(&)(#"
" -#) +"( (# (&"'& & ( (#
( . $&#&!!  #"(&# &
#& ( ",( '($ # ( $$ (#"
$&#&! ' ,)(
 "((' $&#''" # "
)"'# ( . 
& "'(&)(#"
# $&#&! '-"&#"#)'
$&#''" # " )"'# (
.  & "'(&)(#"
" -#) +"( (# (&"'& & ( (#
( . $&#&!!  #"(&# & )(
&()&" #"(&# (# ( $$ (#" $&#&!
#& ( !'' ' ,)(  '#
'  )"(#"
 &#''' " )"'# ( .
 +&( "'(&)(#"
# $&#&! '-"&#"#)'
$&#''" # " )"'# (
.  +&( "'(&)(#"
" -#) +"( (# &* +&( (
&#! ( . $&#&!!  #"(&# &
#& ( ",( '($ # ( $$ (#"
$&#&! ' ,)(
 "((' $&#''" # "
)"'# ( . 
+&( "'(&)(#"
# $&#&! '-"&#"#)'
$&#''" # " )"'# (
.  +&( "'(&)(#"
" -#) +"( (# &* +&( ( &#!
( . $&#&!!  #"(&# & )(
&()&" #"(&# (# ( $$ (#" $&#&!
#& ( !'' ' ,)(  '#
'  )"(#"
" . $&#&!!  #"(&# & "&(' ''  "'(&)(#" #&&'$#""  #&
 )"(#" !)'(  )' - ( #"(&# #$&#''#& (# "  ( &%)'( " . $&#&!!  #"(&# &
"&(' ''  "'(&)(#" #&&'$#""  #&  )"(#" !)'(  )' - (
#"(&# #$&#''#& (# " ( &%)'(
When a PLC-5 programmable controller initiates an unsolicited read/write
MSG instruction, use read/write MSG functions in the control coprocessor
for transferring small amounts of data between the programmable
controller and the control coprocessor. The maximum size that you can
specify for the buffer in the read/write MSG function is 240 bytes for a
read and 234 bytes for a write.
For transferring larger amounts of data between the programmable
controller and the control coprocessor, use a read/write MSG function in
conjunction with a read/write DTL function in your control-coprocessor
program. You can transfer up to 1,000 words between the control
coprocessor and a PLC-5 programmable controller using the read/write
DTL function.
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