Allen-Bradley A-B QUALITY DL20 Series User Manual page 167

DL20 Parallel Port
Configuration
The following parameters are configured within the SET PARALLEL PORT
menu of the DL20.
HI TRUE LOGIC? (Y for PLC-2/PLC-5 example)
Selecting Y (yes) means that the DL20 is expecting the parallel inputs to be
high (ON) when a logic 1 is represented.
Selecting N (no) means that the DL20 is expecting the parallel inputs to be
low (OFF) when a logic 1 is represented.
BINARY MSG DATA? (N for PLC-2 example) (Y for PLC-5 example)
Selecting Y (yes) means that the DL20 will expect message triggers in a
binary format. (Binary format works well with the PLC-5)
Selecting N (no) means that the DL20 will expect message triggers in a BCD
format. (BCD format works well with the PLC-2)
(N for PLC-2 example). (Y for PLC-5 example)
BINARY VAR DATA?
Selecting Y (yes) means that the DL20 will expect variable data to be
strobed in a binary format.
Selecting N (no) means that the DL20 will expect variable data to be strobed
in a BCD format.
TIME SAMPLE? (Y for PLC-2 / PLC-5 example)
Selecting Y (yes) means that all parallel port data will be sampled
automatically at a rate determined by the SCAN TIME. If DC parallel port
operation was selected the user is also prompted for DEBOUNCE TIME.
Selecting N (no) means that the user wishes to use the edge triggered strobe
(ETS) input to strobe all data into the parallel port. The user is then
restricted to a DC voltage interface and must select "high to low" or "low to
high" edge sensing for the ETS input. The ETS lines of the DL20 are
provided for use with other manufacturers programmable controllers having
output modules with strobe lines.
USE NG 1/2 SER A,B? (N for PLC-2 / PLC-5 example)
Selecting Y (yes) means that a Parallel Input Converter (Catalog No.
2706-NG1, -NG2 Series A or B) is being used. TIME DRIVEN must have
been selected previously.
Selecting No (no) means that a DC parallel interface or Parallel Input
Converter (Catalog No. 2706-NG1, -NG2 Series C or later) is being used.
Appendix G
Application Notes
G–15