The record length. You can specify the record length using the
RECSIZE option of the ENVIRONMENT attribute, of the DD:ddname environment variable,
or of the TITLE option of the OPEN statement.
For files associated with the terminal device (CON:, STDOUT:, or STDERR:), PL/I
uses a default record length of 120 when the RECSIZE option is not
specified.
Developer for System z PL/I for Windows, Version 8.0, Programming Guide