User Manual

9.395 NAIS-FP-Latching-Relay

This page describes the device driver and the device window for the NAIS-FP-Latching-Relay device. This device controls a latching relay or wave guide switch. To change the position, it applies a current pulse to one of the motors/drive coils at the switch. On the other hand it monitors the switch position by means of two position contacts. The figure below shows an example how to connect a wave guide switch to the PLC.

Multiple devices of this type (and other members of the NAIS-FP-* -family) may refer to one single PLC device. To do so, configure these devices to share the serial interface of the PLC and set the configuration parameters of each particular switch/monitoring device to the same PLC (address) but to individual ports.

Device window pages

The following table shows which device window pages are available with this individual device type. Tool-bar functions not mentioned here are described at the general description of device windows .

--- Shows / commands the switch position.
--- The faults page.
--- The device info page.
--- The maintenance page. The configuration parameters described below are set at this page.

Configuration parameters

At the maintenance page of the device window there are a couple of configuration parameters which must be set to make the software talk to the alarm monitoring input at the PLC.

parameter	description
address	The packet address of the PLC device. Usually this is "01".
drivePortA	The address of the output port connected to the drive A motor/coil.
drivePortB	The address of the output port connected to the drive B motor/coil.
readbackPortA	The address of the input port connected to the contact closed at position A.
readbackPortB	The address of the input port connected to the contact closed at position B.
pulse	The duration of the current impulse sent in order to change the position.
Serial	Remember to set the line parameters for the serial interface connected to the FPx PLC device. It requires the somewhat unusual setting 9600,O,8,1 . With multiple NAIS-FP-* -devices referring to the same PLC, the line speed needs to be setup only once.

Remarks

The device address of a FPx PLC usually is "01" (two digit, the leading zero is mandatory).
Port addresses used with the PLC are 4 digit hex numbers (upper case digits 'A'..'F', always padded to 4 characters with leading zeroes). The ports on a FPx device itself start at "0000" (inputs and output use their own address spaces). See the PLC manual for the addresses of I/O ports located at extension modules.
The FPx PLC must be switched to "RUN" mode. It will not reply in "PGM" mode.
The M&C software uses the PLC as a "dumb" I/O device. It assumes that no program is loaded to the PLC (you can use it "out of the box"). If you need to run a program on the same PLC device anyhow, ensure that the program does not access the same I/O registers the M&C addresses.
The A/B switch position assignment easily can be reverted by exchanging the port numbers at the configuration parameters.

Variables defined by this device driver

name	type	flags	range
info.driver	TEXT	R/O	StringRange R/O
lowLevel.cmd	TEXT		StringRange
lowLevel.reply	TEXT	R/O	StringRange R/O
faults.99	ALARM	R/O	AlarmFlagRange R/O (Communication)
faults.commstat	TEXT	R/O	StringRange R/O
info.type	TEXT	R/O	StringRange R/O
info.port	TEXT	R/O	StringRange R/O
info.frame	TEXT	R/O	StringRange R/O
config.drivePortA	TEXT	SAVE SETUP	StringRange
config.drivePortB	TEXT	SAVE SETUP	StringRange
config.readbackPortA	TEXT	SAVE SETUP	StringRange
config.readbackPortB	TEXT	SAVE SETUP	StringRange
config.pulse	FLOAT	SAVE SETUP	DoubleRange (0.0 .. 2.0)
position	CHOICE		EnumRange (A B)
internal.readA	BOOLEAN	R/O	BooleanRange R/O (true false)
internal.readB	BOOLEAN	R/O	BooleanRange R/O (true false)
faults.01	ALARM	R/O	AlarmFlagRange R/O (Indifferent position)