欧姆龙PLC操作手册_c20p_c28p_c40p_c60p(3)

Nomenclature

Indicators

CPU Left/Right Selector

Horizontal Mounting

4

Section 1-1

The following diagram shows the functions of the various indicators, takingthe C20P as an example.

OUTPUT 5 CH

0 1 2 3 4 5 6 7OUTPUT: Shows whether the output is ON or OFF.

POWER

POWER: Stays lit while power is turned ON to theI/O Unit.

INPUT 0 CH

0 1 2 3 4 5 6 78 9 10 11INPUT: Shows whether the input ON or OFF.

The C20P, C28P, C40P, and C60P Expansion I/O Units all have CPU left/right selector switches. The C16P and C4K do not. For those models whichhave the switch, care must be taken to set it so that it corresponds with thedirection of the I/O Connecting Cable. If the switch is set in the wrong direc-tion, the System will operate as if the I/O Unit were not there. Set the switchso that the CPU connector side (Left or Right) is “in,” as shown in the follow-ing diagram. Do not change the switch setting after power has been turnedON, as this will cause the I/O bus to malfunction.

LRLin RoutFromTo I/O CPU

LinkUnit

LRRin LoutTo I/O FromLinkCPU

Unit

The following example diagrams show the proper switch settings for horizon-tal and vertical mounting of Units.

All Units can be positioned horizontally.

C20P-CN501CPUI/O UnitSet to Left in Right outNomenclature

Vertical Mounting

Section 1-1

All Units except the C16P and C4K can be positioned vertically.

CPUC20P-CN411

I/O UnitSet to Right in Left out

1-1-3Analog Timer Unit

CPU connector

Install and connect the ExpansionI/O Unit and the CPU horizontally;otherwise the Analog Timer Unitcannot be connected to the CPU.

Internal variable resistors

These variable resistors are used to set the timersand, from left to right, correspond to T0 to T3. Thesettings of these resistors are effective only when thecorresponding IN/EXT selector is set to IN. To set oradjust the time, use the screwdriver supplied with theAnalog Timer Unit. Turn the variable resistor shaftsclockwise to increase the time value.

Min.Max.Two M4 mounting screws (self-rising pressure plate)Indicators

The SET indicators in the toprow light while timer valuesare being set. The TIME UPindicators in the bottom rowlight when the correspondingtimer contact (T0 to T3) turnsON. Numbers 00 to 03 corre-spond to T0 to T3.

I/O Connecting CableC4K-CN502

One cable is supplied with theAnalog Timer Unit

IN/EXT selectors

When using the internal variableresistor, set the corresponding pin toIN; when using an external variableresistor, set the corresponding pin toEXT. These selectors correspond toT0 to T3 from left to right.

This connector is not used. Do not remove the cover.

External variable resistor connectors

When using external variable resistors to set the timers, connect theresistors to these connectors. The corresponding IN/EXT selectormust be set to the EXT position. These connectors correspond toT0 to T3 from left to right. Use 20 kW external variable resistors. AConnecting Cable with a 2-m lead is available for a variable resistor(C4K-CN223).

5

Nomenclature

External Variable Resistor

Section 1-1

The contactor employs solderless terminals and must be wired as shown be-low, using AWG 22 to 28 lead wires.

Analog Timer Unitconnector

External variableresistor (20 kW)

1-1-4I/O Link Units

The I/O Link Unit must be used as a Remote I/O Slave, and must be usedwith a Remote I/O Master. Refer to the Remote I/O Unit Operation Guide fordetails.

Operation output terminalIndicates that the power is ONand that the CPU is in RUN orMONITOR mode with no errors.

Repeater Output Terminal

Sends repeater signals to a LinkAdapter. The repeater output is ONwhen power is ON in the CPU andI/O Link Unit. (See the Link AdapterManual for details.)

Power indicator

Transmitting error indicator

Blinks during normal transmission.Lights continuously to indicate atransmission or connection error.

Optical fiber connectors

CPU or ExpansionI/O Unit connector

AC power supply

Ground

6

System ConfigurationSection 1-2

1-2System Configuration

Depending on your control requirements, you can combine various Units fora total number of I/O points ranging anywhere from 20 to 148.

A P-type PC consists of a CPU Unit plus one or more of the following Units:Expansion I/O Units, Analog Timer Units, Analog I/O Units, or an I/O LinkUnit. All of these Units are connected in series with the CPU Unit at one end.An I/O Link Unit, if included, must be on the other end (meaning only one I/OLink Unit can be used) and an Analog Timer Unit cannot be used with. Therest of the Units can be in any order desired. The Units from which P-typePCs can be built are shown below.

Unit type

CPU

C20PC28PC40PC60P

Expansion I/O Unit

C4KC20PC28PC40PC60P

Special I/O Units

Analog Timer UnitC4K Analog Input UnitC1K Analog Input UnitAnalog Output UnitI/O Link Unit

Name

Wordsoccupied22442224422222

Inputsprovided12 points16 points24 points32 points12 points16 points24 points32 points4 timer inputs4 analog inputs1 analog input1 analog output

16 input and 16 output bits

Outputsprovided8 points12 points16 points24 points8 points12 points16 points24 points

4 input points or 4 output points

When determining which configuration to use, another factor to consider isthe ease with which I/O points can be assigned. In order to make the processas simple as possible, it is recommended that a CPU be used which has

more I/O points than the largest Expansion I/O Unit. For example, rather thancombining a C20P CPU with a C20P Expansion I/O Unit, it would be prefer-able to use a C40P CPU. Similarly, combining a C60P CPU with a C40 Ex-pansion I/O Unit would be better than using a C40P CPU and a C60P Expan-sion I/O Unit.

The tables on the following pages show the possible configurations for aP-type PC. Although the tables branch to show the various possibilities atany one point, there can be no branching in the actual PC connections. Youcan choose either branch at any point and go as far as required, i.e., you canbreak off at any point to create a smaller PC System.When implementing asystem there is a physical restriction on the total cable length allowable. Thesum of the lengths of all cables in the system must be limited to less than 1.2meters.

The tables also show I/O word allocations for the Units in the systems andwhich words will be input words and which words will be output words. All ofthese are determined by the position of the Unit in the configuration exceptfor the C4P and C16P Expansion I/O Units, in which case the model of theUnit determines whether the words are input or output.

7

System Configuration

8

Section 1-2

The symbols used in the table represent the following:

C20P/C28PInputOutputC20P or C28P CPU Unit

C40P/C60PInputOutputInputOutputC40P or C60P CPU orExpansion I/O Unit

C4K/C16PInput or OutputC4K or C16P Expansion I/O Unit

C20P/C28P/TU/AN/LUC20P Expansion I/O Unit, C28P Expansion I/O Unit,InputOutputAnalog Timer Unit, Analog I/O Unit, or I/O Link Unit

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