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Smart Slaves DRT2 Series 17 ● T otal ON T ime Monitor Function The total ON time for each I/O cont act can be calculat ed (unit: s) and recorded in the Slav e. (The CX-Int egrator or e xplicit messages can be used to rea…

16 Smart Slaves DRT2 Series

Smart Slave Functions

● Network Power Voltage Monitor

The present, bottom, and peak values of the Network power voltage

can be recorded in the Slave. Also, the monitor voltage can be set

using the CX-Integrator to maintain the monitor voltage in the slave

(default setting: 14 V), and a Status Area in the Unit will turn ON if

the voltage falls below the monitor voltage.

● Unit Conduction Time Monitor

The total ON time of the Slave's internal circuit power can be

calculated and recorded. (The CX-Integrator or explicit messages

can be used to read the information.)

Also, the monitor value can be maintained in the Slave, and a Status

Area will turn ON in the Unit when the total time reaches the set

value.

● Unit Comment Function

The user can assign and record a name or comment for every Unit

(up to 32 characters).

● Connected Device Comment Function

The user can assign a name for each of the Unit's I/O contacts (up to

32 characters) and record it in the Unit. The connected device can be

checked for each I/O contact, allowing faulty devices to be identified

during remote maintenance.

● Communication Error History Monitor

The error status information (communications error code and

communications power voltage when the error occurred) for the last

four communications errors that occurred can be recorded in the

Slave.

● Last Maintenance Date

This function enables writing to the Unit the date on which

maintenance was last performed. This means that the timing for

future maintenance can be judged more easily.

● Contact Operation Count Monitor Function

The Contact Operation Counter is used to count the number of times

each input or output contact changes from OFF to ON (maximum

sampling cycle: 50 Hz) and record the total value calculated in the

slave. (The CX-Integrator or explicit messages can be used to read

the information.)

The monitor value can be set in the slave, and when the set number

of operations is reached, a bit in the Status Area in the Unit will be

turned ON. (The CX-Integrator or explicit messages can be used to

read the details of the notification.)

• Counted operations: 0 to 4,294,967,295 operations

(Stored data: 0000 0000 to FFFF FFFF hex)

• Counting unit: One operation

Note 1: The Contact Operation Counter and Total ON Time Monitor cannot be used

at the same time for the same contact. Select the function to be used under

the Detection Mode heading.

Note 2: The Contact Operation Counter will operate only when the I/O power is ON.

Recorded in Slave

Total ON time

Internal circuit power

OFF

DeviceNet

Slave

Unit comment

Recorded in Unit

CX-Integrator

DeviceNet

Unit comment

Slave

Connected device

comment

Recorded in Slave

CX-Integrator

DeviceNet

Connected device

comment

Connected device

Status when

communications error

occurred

Slave

Recorded in Slave

First error

Second error

Third error

Forth error

DeviceNet

OFF

123

Slave

OFF

→

Number of

operations

I/O power

Output device

(relay, etc.)

Recorded

in Slave

Number of times

output contact

changes to ON.

Smart Slaves DRT2 Series 17

● Total ON Time Monitor Function

The total ON time for each I/O contact can be calculated (unit: s) and

recorded in the Slave. (The CX-Integrator or explicit messages can

be used to read the information.)

The monitor value can be set in the Slave, and when the set total

time is reached, a bit in the Status Area in the Unit will be turned ON.

(The CX-Integrator or explicit messages can be used to read the

details of the notification.)

• Counted time:0 to 4,294,967,295 seconds

(stored data: 0000 0000 to FFFF FFFF hex)

• Counting unit: One second

Note 1: The Contact Operation Counter and Total ON Time Monitor cannot be used

at the same time for the same contact. Select the function to be used under

the Detection Mode heading.

2: The Total ON Time Monitor operates only when the I/O power is ON.

3: The Total ON Time Monitor checks approximately every second whether the

connected devices are ON.

If the total ON time is calculated for ON times of less than a second, the

measurement may not be accurate.

● Input Filter Function

This function can read the input value several times within a preset

period and reduce the influence of incorrect signals due to switch

chattering or data corrupted by noise. The input filter function can

also be used for ON delay operation and OFF delay operation.

● Function to Prevent Incorrect Inputs Caused by Inrush

Current when Power Is Turned ON (input only)

The I/O power supply can be monitored to stop any input when the

I/O power is OFF and for 100 ms after it is turned ON. This function

reduces incorrect inputs caused by inrush current for 100ms after the

I/O power is turned ON.

● I/O Power Status Monitor Function

This function is used to detect whether the I/O power is ON.

When the I/O power supply

is turned OFF, a bit in the

Status Area in the Unit is

turned ON. (The

CX-Integrator or explicit

messages can be used to

read the content of the

notification.)

Note: The value for detecting a low

voltage for the I/O power

cannot be set.

● Sensor Power Short-circuit Detection Function (input

only)

The sensor power supply current can be monitored, and when the

current reaches or exceeds 100 mA per input contact, a sensor

power short-circuit is detected.

Check whether a sensor power short-circuit has been detected using

the indicators on the slave. When a sensor power short-circuit is

detected, a bit in the Status Area in the Unit will turn ON. (The

CX-Integrator or explicit messages can be used to read the details of

the notification.) The sensor will automatically recover when the

cause of the short-circuit is removed, and the power output to the

connector where the short-circuit was detected will turn ON.

Note: Use a Power Supply Unit with a rated power supply of 50 W or higher for the

communications power supply. A short-circuit is detected when the Unit's

sensor power output current reaches or exceeds 100 mA per input connector.

When a short-circuit occurs, the communications power supply may be

temporarily interrupted. After a short-circuit has been detected, the power will

be automatically restored, but during the power interruption use an external

circuit in the configuration to make sure the system is operating safely.

Use the following equations to calculate the sensor's current consumption.

• Total network current = Total Unit current consumption + Total sensor

current consumption

• Communications power supply capacity  (Total network current +

Short-circuit detection current) x (=100 mA) x (DeviceNet network voltage)

●

External Load Short-circuit Detection Function (output only)

The load current of the Output Unit can be monitored, and an

external load short-circuit can be detected when the current exceeds

a set value per contact (or per common). When an external load

short-circuit is detected, the output is turned OFF to prevent damage

to the Unit's output circuit. The LED indicators on the Slave Unit can

be used to check which contact has been detected as having an

external load short-circuit. When an external load short-circuit is

detected, a bit in the Status Area in the Unit will turn ON. (The

CX-Integrator or explicit messages can be used to read the details of

the notification.)

Manual recovery is the only way to remove the cause of the

short-circuit.

Note: The OMRON S8@@ Power Supply Unit is recommended for the I/O power

supply.

If a Power Supply Unit with a dropping overcurrent protection characteristic is

used, the load short-circuit may not be detected. Always use a Power Supply

Unit with a rating of 100 W or higher if it uses a dropping overcurrent protection

characteristic.

OFF

Slave

To ta l

ON time

Connected device

I/O power supply

Sensor

Total

ON time

Stored in

Slave

1234

OFF

Data input

OFF

OFF OFF ON

1234

OFF

Data input

ON delay time

(Equal to the input filter time.)

OFF

ON ON ON

The signal is

considered OFF

because all four

readings were

not ON.

The signal is

considered ON

because all

four readings

were ON.

Slave

I/O

power voltage

I/O power

Sensor

Monitors whether

I/O power is ON.

Slave

Has the sensor

power shorted?

Sensor

Short-circuit

Slave

External load

Output forced OFF

Short-circuit

Has the external

load shorted?

18 Transistor Remote I/O Terminals DRT2-@D08(-1)/@D16(-1)

Transistor Remote I/O Terminals

DRT2-

D08(-1)/@D16(-1)

Allows I/O Expansion with

Transistor Terminals

• Wide variety of data, such as maintenance system data, can be collected

without affecting the productivity of the control system.

• Valuable information can be collected and managed through the

network, including information on the communications power supply

voltage levels, Unit wear and tear, and equipment operating information.

• Expansion via Expansion I/O Units

• With no communications baud rate settings required and detachable

terminal blocks, maintenance is easier.

Smart Slave Functions

*1. The operation time monitor cannot be used with the DRT2-@D08(-1).

*2. Expansion Units cannot be added with the DRT2-@D08(-1)or DRT2-MD16(-1).

Ordering Information

Expansion Units

One Expansion Unit can be added to each DRT2-ID16(-1)/-OD16(-1) or DRT2-ROS16 I/O Slave.

The following Expansion Units are available to enable flexible expansion with combinations for the required number of points.

Specifications I/O connections

Rated internal circuit

power supply voltage

Rated I/O power

supply voltage

Model

Inputs

NPN (+ common)

16 points

Screw terminals

Supplied from the

communications

connector

24 VDC

DRT2-ID16

PNP (- common) DRT2-ID16-1

Outputs

NPN (- common) DRT2-OD16

PNP (+ common) DRT2-OD16-1

I/O

NPN (input: + common, output: - common)

Input: 8 points/

Output: 8 points

DRT2-MD16

PNP (input: - common, output: + common) DRT2-MD16-1

Inputs

NPN (+ common)

8 points

DRT2-ID08

PNP (- common) DRT2-ID08-1

Outputs

NPN (- common)

8 points

DRT2-OD08

PNP (+ common) DRT2-OD08-1

Model Number of I/O points

XWT-ID08 8-point inputs (NPN)

XWT-ID08-1 8-point inputs (PNP)

XWT-OD08 8-point outputs (NPN)

XWT-OD08-1 8-point outputs (PNP)

XWT-ID16 16-point inputs (NPN)

XWT-ID16-1 16-point inputs (PNP)

XWT-OD16 16-point outputs (NPN)

XWT-OD16-1 16-point outputs (PNP)

Power-ON inrush current protection (input or I/O only)

Operation time monitor (input and output only) *1

Contact operation counter Unit conduction time monitor

Total ON time monitor Unit comments Connected device comments

Network power supply voltage monitor I/O power supply monitor function Communications error log monitor

Input filter (input or I/O only)

Removable terminal block Communications speed auto-detection No need to wire Unit power supply

Expansion via Expansion I/O Units *2 Last maintenance date