Rockwell-automation 61C365 4 Output 4-20mA Analog Rail Manuel d'utilisateur télécharger pdf (Page 13)

2Ć3

The faceplate of the module contains three electrical connectors

labeled Input", Analog Outputs", and Input Power" (reading top to

bottom). The top connector is used for connection to the I/O port. A

cable (M/N 45C5) is provided for this purpose. The second

connector, labeled Analog Outputs", is a numbered, 12Ćpoint

removable plug connector with screwĆtype terminal points. Three

successive terminal points are reserved for each channel's

connection to external hardware. The Analog Output" terminals are

designed for 14Ć22 AWG wire.

The third connector on the faceplate, also a removable plug

connector with screwĆtype terminal points, is used for input power.

The terminal points are labeled. The top two points are used if the

power source is 24 VDC. The bottom two points are used if the

power source is 120 VAC. The Input Power" terminals are designed

to use 14 AWG wire. A terminal stud for connecting a grounding

conductor is provided on the bottom of the rightĆhand mounting

flange.

The module faceplate also contains two LEDs, a mode switch, and a

fuse holder and fuse. The LED labeled PWR OK" indicates that the

I/O port, the external power source, and the internallyĆgenerated

voltages necessary for operation of the module are present. The

COM OK" LED indicates whether all four channels are successfully

communicating with the host.

The switch labeled Mode" is used to select between Local Head"

and Rail" mode. Note that the position of the switch is read only

once at the time power is turned on to the Reliance device that is

connected to the Analog Rail module. The mode will remain fixed as

long as this device is powered up.

As shipped from the factory, the fuse holder on the bottom of

the faceplate contains a .25A fuse for 120 VAC input power. If

input power will be 24 VDC, you need to replace the fuse with

the .75A fuse included along with the Analog Rail module.

2.2 Electrical Description

The Analog Rail module contains four output channels that can

output 4Ć20mA analog signals proportional to an input value of 0 to

4095. A userĆsupplied power supply in series with the external

hardware is required for the output channels. Note that at a digital

output = 4096, the output rolls over to zero again. Negative output

values cannot be accommodated.

The D/A conversions are triggered by the actual I/O update

sequences. The conversion rate is therefore dependent upon the

scan time of the application task. See figure 2.2 for a typical output

circuit.

1 2 ... 8 9 10 11 12 13 14 15 16 17 18 ... 45 46

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Rockwell-automation 61C365 4 Output 4-20mA Analog Rail Manuel d'utilisateur Page 13

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