User guide

Hardware
34
890 USE 108 00 August 2001
Slide Switches Two three-position slide switches are located on the front of the CPU. The top
switch is used for memory protection when in the top position and no memory
protection in the middle and bottom position. The three-position slide switch on the
bottom is used to select the communication parameter settings for Modbus (RJ45)
port one. Three options are available. (See MODBUS Port Parameters (3-Position
Slide Switch), p. 76). For RJ45 cable pin-outs, see Connector Pinouts (RJ45 to 25-
Pin, p. 75).
PLC Interrupt
Connection
One two-position connection is located on the front of the CPU. It is used to connect
to the 470 GPS 001 00 Receiver for the time synchronization of the PLCs TOD clock.
(See Time Synchronization of the TOD (E984-258/265/275/285 Only), p. 22).
Note: The E984-258 does not support a PCMCIA card.