User manual

Magelis XBT OT User Manual
3-16
3.2.3 Interface Specifications
This section describes the specifications of each interface of the OT Series unit.
DANGER
ELECTRIC SHOCK
• The OT unit’s serial port is not isolated. When the host (PLC) unit is also not isolated, be sure to
connect the #5 SG (Signal Ground) terminal to reduce the risk of damaging the RS-232C/
RS-422 circuit.
• When connecting an external device to the OT using the SG terminal, be sure to check that no
short-circuit loop is created when you setup the system.
• The same type of connector is used for the different signal types on COM1 and COM2 of the
OT. Be careful not to mistake one for the other. Connecting them incorrectly disables
communication.
Failure to follow these instructions will result in death or serious injury.
• Connecting the RS-232C isolation unit (XBTZGI232) to COM1 enables isolation if
needed.