GE GFK-2251 manual Communications, PLC/PC Connection

7

Communications

PLC/PC Connection

Symptom	Possible Causes	Solution
PANEL C does not	The system is attempting to	1. With the PLC powered up
communicate with a PLC that	communicate with a 90-30 PLC	and connected to the Display
has been autoconfigured	using the SNP driver and a	Station, establish
(AUTOCONFIG/DEFAULT/I/O	PANEL C project.	communication between the
error).		Display Station and PLC via
		the 90-30 SNP driver.
		2. Using a Hand-Held
		Programmer, toggle the Default
		I/O (Enable or Disable)
		configuration parameter for the
		CPU. Communications
		between the computer and the
		PLC will be stopped.
		(Communications are stopped
		when you toggle from Enable
		to Disable, or vice versa.)
		3. Power cycle the PLC.
Communications between the	COM port not configured in	Verify that the COM port is
host computer and the	system.	configured in the system.
controller are unsuccessful.
	Cabling between computer and	Verify that the cable between
	controller.	the computer and the controller
		is correctly wired.
	Baud rate and parity configured	Verify that the baud rate and
	incorrectly.	parity on the computer are
		consistent with those on the
		controller.

Wrong address.

Verify that the slave address is correct.

CNC/PC Communications

Symptom	Possible Causes	Solution
Communications between the	If an ISA interface HSSB card,	Check PC for conflicting I/O
host computer and the CNC	the I/O address may be in	addresses
are unsuccessful.	conflict with other devices
	HSSB switch setting may be	Check that the switch is set to
	incorrect.	0, 1 or 2.
	The HSSB driver is not	Check Windows event log for
	installed	errors that the HSSB driver
		(MMCNCD) is not installed
	The HSSB option may not be	Verify that the option and
	active in the CNC	correct CNC Executive
		Software is installed in the
		CNC
	The cable connecting the CNC	Verify that the green LED on
	and the PC may not be	the HSSB board is on.
	attached

7-4 Panel C Industrial Computer Hardware User's Manual – May 2003 GFK-2251