Siemens CPU 948 - Page 448

Warning The function could be executed; the function call must be repeated,
e.g. in the next cycle.
The following warning numbers (evaluation of the condition code
byte) can occur:
Condition
code byte
Significance
129 The SEND function cannot transfer data, since the
transmitting capacity was already zero when the
function was called.
Transmitting capacity The "transmitting capacity" indicates how many data fileds can still be
sent and buffered.
SEND Function (OB 202)
CPU 948 Programming Guide
10 - 44 C79000-G8576-C848-04