Relay Outputs

Overview

The Modicon M241 Logic Controller has digital outputs embedded:

Reference	Total number of digital outputs	Fast transistor outputs ⁽¹⁾	Relay outputs	Regular transistor outputs
TM241C••24R	10	4	6	0
TM241C••24T TM241C••24U	10	4	0	6
TM241C•40R	16	4	12	0
TM241C•40T TM241C•40U	16	4	0	12
(1) Fast transistor outputs which can be used as 100 kHz PTO outputs

For more information, refer to Output Management.

DANGER
	FIRE HAZARD Use only the correct wire sizes for the maximum current capacity of the I/O channels and power supplies. For relay output (2 A) wiring, use conductors of at least 0.5 mm² (AWG 20) with a temperature rating of at least 80 °C (176 °F). For common conductors of relay output wiring (7 A), or relay output wiring greater than 2 A, use conductors of at least 1.0 mm² (AWG 16) with a temperature rating of at least 80 °C (176 °F). Failure to follow these instructions will result in death or serious injury.

DANGER

FIRE HAZARD

Use only the correct wire sizes for the maximum current capacity of the I/O channels and power supplies.
For relay output (2 A) wiring, use conductors of at least 0.5 mm² (AWG 20) with a temperature rating of at least 80 °C (176 °F).
For common conductors of relay output wiring (7 A), or relay output wiring greater than 2 A, use conductors of at least 1.0 mm² (AWG 16) with a temperature rating of at least 80 °C (176 °F).

Failure to follow these instructions will result in death or serious injury.

WARNING
	UNINTENDED EQUIPMENT OPERATION Do not exceed any of the rated values specified in the environmental and electrical characteristics tables. Failure to follow these instructions can result in death, serious injury, or equipment damage.

Relay Outputs Status LEDs

The following figure shows the status LEDs for the TM241C••24• controller (the TM241C•40• controllers are similar with 40 LEDs):

LED	Color	Status	Description
0...9	Green	On	The output channel is activated
0...9	Green	Off	The output channel is deactivated

Relay Outputs Characteristics

The following table describes the characteristics of the M241 Logic Controller relay outputs:

Characteristic		Value
Characteristic		TM241C••24R	TM241C•40R
Number of relay output channels		6 outputs (Q4...Q9)	12 outputs (Q4...Q15)
Number of channel groups		1 common line for Q4, Q5 1 common line for Q6, Q7 1 line for Q8 1 line for Q9	1 common line for Q4...Q7 1 common line for Q8, Q9 1 common line for Q10, Q11 1 common line for Q12, Q13 1 line for Q14 1 line for Q15
Output type		Relay
Contact type		NO (Normally Open)
Rated output voltage		24 Vdc, 240 Vac
Maximum voltage		30 Vdc, 264 Vac
Minimum switching load		5 Vdc at 10 mA
Derating		No derating	Derating on Q4...Q7, refer to the note 2.
Rated output current		2 A
Maximum output current		2 A per output
Maximum output current		4 A per common
Maximum output frequency with maximum load		20 operations per minute
Turn on time		Max. 10 ms
Turn off time		Max. 10 ms
Contact resistance		30 mΩ max
Mechanical life		20 million operations
Electrical life	Under resistive load	See power limitation
Electrical life	Under inductive load	See power limitation
Protection against short circuit		No
Isolation	Between output and internal logic	500 Vac
Isolation	Between channel groups	1500 Vac
Connection type		Removable screw terminal blocks
Connector insertion/removal durability		Over 100 times
Cable	Type	Unshielded
Cable	Length	Max. 30 m (98 ft)
(1) Refer to Protecting Outputs from Inductive Load Damage for additional information concerning output protection. (2) When Q4, Q5, Q6 and Q7 are on the same common line (max output current 4 A), those 4 outputs used simultaneously have a derating of 50%.

Power Limitation

The following table describes the power limitation of the relay outputs depending on the voltage, the type of load, and the number of operations required.

These controllers do not support capacitive loads.

WARNING
	RELAY OUTPUTS WELDED CLOSED Always protect relay outputs from inductive alternating current load damage using an appropriate external protective circuit or device. Do not connect relay outputs to capacitive loads. Failure to follow these instructions can result in death, serious injury, or equipment damage.

Power Limitations
Voltage	24 Vdc	120 Vac	240 Vac	Number of operations
Power of resistive loads AC-12	–	240 VA 80 VA	480 VA 160 VA	100,000 300,000
Power of inductive loads AC-15 (cos ϕ = 0.35)	–	60 VA 18 VA	120 VA 36 VA	100,000 300,000
Power of inductive loads AC-14 (cos ϕ = 0.7)	–	120 VA 36 VA	240 VA 72 VA	100,000 300,000
Power of resistive loads DC-12	48 W 16 W	–	–	100,000 300,000
Power of inductive loads DC-13 L/R = 7 ms	24 W 7.2 W	–	–	100,000 300,000

Power Limitations

Voltage

24 Vdc

120 Vac

240 Vac

Number of operations

Power of resistive loads

AC-12

–

240 VA

80 VA

480 VA

160 VA

100,000

300,000

Power of inductive loads

AC-15 (cos ϕ = 0.35)

–

60 VA

18 VA

120 VA

36 VA

100,000

300,000

Power of inductive loads

AC-14 (cos ϕ = 0.7)

–

120 VA

36 VA

240 VA

72 VA

100,000

300,000

Power of resistive loads

DC-12

48 W

16 W

–

100,000

300,000

Power of inductive loads

DC-13 L/R = 7 ms

24 W

7.2 W

–

100,000

300,000

Removing Terminal Block

Refer to Removing Terminal Block.

TM241C••24R Relay Outputs Wiring Diagrams

The following figure shows the wiring of the outputs:

* Type T fuse

(1) The terminals COM1 to COM4 are not connected internally.

(2) To improve the life time of the contacts, and to protect from potential inductive load damage, you must connect a free wheeling diode in parallel to each inductive DC load or an RC snubber in parallel of each inductive AC load

Refer to Protecting Outputs from Inductive Load Damage for additional information concerning output protection.

NOTE: The assigned fuse values have been specified for the maximum current characteristics of the controller I/O and associated commons. You may have other considerations that are applicable based on the unique types of input and output devices you connect, and you should size your fuses accordingly.

TM241C•40R Relay Outputs Wiring Diagrams

The following figure shows the wiring of the outputs:

* Type T fuse

(1) The terminals COM1 to COM6 are not connected internally.

(2) To improve the life time of the contacts, and to protect from potential inductive load damage, you must connect a free wheeling diode in parallel to each inductive DC load or an RC snubber in parallel of each inductive AC load

Refer to Protecting Outputs from Inductive Load Damage for additional information concerning output protection.

NOTE: The assigned fuse values have been specified for the maximum current characteristics of the controller I/O and associated commons. You may have other considerations that are applicable based on the unique types of input and output devices you connect, and you should size your fuses accordingly.