Wiring: Aromat (NAiS)

Wiring: Aromat (NAiS)

Revision: 4.9

Download this page along with the Notes and Memory Usage as a Microsoft Word file "Notes.doc" for best printing. This file is included on the disks that come with the MSP and with all driver downloads.

Sink/Source Logic Sense. Depending on whether the I/O is sink or source the on and off versus true false logic sense may change. For the input drivers the rung that moves the hardware input to the driver input may have to be edited. For the output drivers the rung that moves the driver output to the hardware output may have to be edited. These are the same rungs that would be edited if the I/O address were changed. The following table shows what the sense of the contacts on these rungs should be and what it is the default in the driver library.

I/O	TYPE	CONTACT	DEFAULT LOGIC SENSE
Input	Sink	Open	Default
	Source	Close
Output	Sink	Close	Default
	Source	Open

Input Filters. In the FPO the input filter times are fixed. Inputs X0 - X5 have filters times 100 microseconds or less and are the best ones to use with the MSP. X6 and greater have filter times of 2 msec or less and should be avoided. If X6 and greater are used you may have to increase the scan time to yield reliable operation. In general the filter should be no more than 5% of the scan time although we have found in some cases 10% is acceptable. If the filter is 2 msec the scan time should be 40 msec or greater but may work at 20 msec. If filter times cannot be set low enough for the desired scan time you should test your installation for allowable limits.

In other models the input time constant is adjustable.

Sink/Source Inputs. The DC inputs in Aromat(NAiS) FP0 can be used for either sink or source. We have used them only for sink. See the next note on Sinking inputs for a schematic and more details.

Sink Inputs. Each input is basically a resistor with one end of each resistor tied to individual terminals. The other ends are tied together to a terminal marked "Com". This pull down resistance sinks voltage and current to common VDC.

The output on the MSP is designed to be used as either sink or source. The MSP contains a sinking gate and pull-up resistor. Sink inputs can be wired directly to the MSP.

We tested the FPO using sinking inputs. In the single channel drivers for the FP0 the input is X0 but may be changed if desired. In the multiplexed drivers for the FP0 Channel 0 and 1 are X0 and X1 respectively but may be changed if desired.

Make sure that the PLC input module and MSP input get their 24 VDC from the same source. Following is a schematic of a typical input. "X?" may be any valid input.

Source Inputs. Each input is basically a resistor with one end of each resistor tied to individual terminals. The other ends are tied together to a terminal that is tied to COM. This pull up resistance sources voltage and current from +VDC.

The output on the MSP is designed to be used as either sink or source. The MSP contains a sinking gate and pull-up resistor. Source inputs can be wired directly to the MSP.

Using the input as source would increase the level of the signal and make it more immune to noise but it would double the current required when the signal is pulled to zero volts.

Make sure that the PLC input module and MSP input get their 24 VDC from the same source. Following is a schematic of a typical input. "X?" may be any valid input.

Relay Outputs. Relay outputs can be used as either sink or source. The FP0 units with removable terminal strips have only mechanical relay outputs. We tested one of these units and found it worked reliably. We had to slow the output driver down in order to allow for the slower switch time of the mechanical relay. We used a scan time of 50 msec for the FPO with relays and the MSP analog output modules.

Output on Demand. In order to conserve the life of the relay output, the output drivers contain some extra logic that allows control of when the output is transmitted. There are two bits for the user to access for this control.

The first bit "Contn Xmit" (Continuos Transmit) when turned on will cause the output to transmit continuously. When this bit is turned off the driver will complete the current transmission and then will remaining off. The continuous transmission bit has been forced on by ladder logic by default but may be edited if desired.

The second bit "Singl Xmit" (Single Transmit) causes the output to transmit one time. Only the off to on transition of this bit will cause a transmission. The continuous transmission bit takes priority over the single transmission bit. The continuous transmission bit must be turned off in order to use the single transmission bit. It is recommended that if the single transmission bit is use that the Delta Refresh Count Preset be set to zero(0). When the Delta Refresh Count Preset is set to zero(0) the full 16 bit value will be transited every time and the delta transmission is effectively turned off.

Input/Output Scan Time Ratio. For those drivers using both inputs and outputs there is logic that runs the output a factor of 5 times slower than the input. This allows the input to run at a scan time of 10 msec and the output to run a scan time of 50 msec. This is necessary only when relay outputs must be used.

Source (PNP) Outputs. Each output is basically a transistor or gate with one end of each transistor tied to individual terminals. The other ends are tied together to a terminal that is usually labeled COM. This pull up transistor sources voltage and current from +VDC.

The input on the MSP is sink; it is basically a resistor tied to -VDC or common. Source outputs can be wired directly to the MSP.

Make sure that the PLC output module and MSP output get their 24 VDC from the same source. Following is a schematic of a typical output. "Y?" may be any valid output.

Sink (NPN) Outputs. Each output is basically a transistor or gate with one end of each transistor tied to individual terminals. The other ends are tied together to a terminal that is usually labeled COM VDC. This pull down transistor sinks voltage and current to COM VDC.

The input on the MSP is sink; it is basically a resistor tied to -VDC or common. Since both PLC output and MSP are sink a pull up resistor must be used. Sink outputs can be wired directly to the MSP with a pull-up resistor.

These are the most common types of outputs for the FPO. In the single channel drivers the output is Y0 but may be changed if desired. In the multiplexed drivers Channel 0 and 1 are Y0 and Y1 respectively but may be changed if desired.

Make sure that the PLC output module and MSP output get their 24 VDC from the same source. Following is a schematic of a typical output. "Y?" may be any valid output.

SensorPulse Corp. • P.O. Box 8886 • Michigan City, IN 46361 • Ph: (800) 447-5900 or (219) 393-7218 • Fax: (219) 393-7318