User guide

Hardware
890 USE 108 00 August 2001 21
When downloading a new executive to your PLC you MUST disable the PLC
password (via Concept) unless the PLC is stopped in a stop with error state. Under
this condition the Concept executive loader works. When a login password is lost,
you can gain access by using the following procedure: Push the Memory Protection
switch up to the Mem Prot position. Remove the Lithium battery from the PLC. Cycle
the power to the PLC. This procedure erases the battery-backup RAM without
loading the PLCs program from FLASH. Thus, returning the PLC to its initial,
unconfigured state with NO login password.
CTS/RTS
Communication
Delays for
Communication
Port 1
(E984-258/265/
275/285 Only)
This feature allows you to set time delays for CTS or RTS independently for
Communication port 1 of your Compact PLC. The CTS delay sets the amount of time
between when the PLC receives CTS and when a Modbus slave response is
transmitted. The RTS delay is the amount of time the PLC waits to drop RTS after a
Modbus slave response is transmitted. This feature allows modem communications
with radios that require longer time frames. The delay time range is 0... 500ms using
10ms units. From the main Concept menu select Configure, then RTU Extension.
The RTU-Specific Parameters dialog box appears. Enter the time delays your
require. Then confirm with OK.
This is the CTS/RTS screen.
RTU Specific Parameters
RTS-Delay (x10 ms):
Additional COM1-Delay
CTS-Delay (x10 ms):
OK
Cancel