See Output Management for more information on managing outputs.
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FIRE HAZARD |
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oUse only the correct wire sizes for the current capacity of the I/O channels and power supplies. oFor 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). oFor common conductors of relay output wiring (4 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). |
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Failure to follow these instructions will result in death or serious injury. |
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UNINTENDED EQUIPMENT OPERATION |
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Do not exceed any of the rated values specified in the environmental and electrical characteristics tables. |
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Failure to follow these instructions can result in death, serious injury, or equipment damage. |
The table below describes the characteristics of the M218 controller relay outputs:
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Characteristic |
Value |
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Rated voltage |
24 Vdc, 220 Vac |
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Input range |
5...30 Vdc, 100...250 Vac |
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Rated current |
Maximum 2 A for each point (see de-rating curve below) |
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Current/group (4 points) |
4 A (see de-rating curve below) |
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Inrush values |
Maximum switching voltage |
250 Vac, 30 Vdc |
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Current/point |
5 A |
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Isolation |
Between channels within same category: |
None |
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Between channels in different categories: |
1780 Vac / 2500 Vdc |
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Between channels and internal logic: |
1780 Vac / 2500 Vdc |
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Maximum output frequency |
With maximum load |
0.1 Hz |
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Without load |
5 Hz |
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Contact opening time |
Typically 5 ms |
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Contact closing time |
Typically 2 ms |
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Resistive load |
2 A/point for 24 Vdc/220 Vac |
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Mechanical life |
20 million operation minimum at 25 °C (77 °F) for maximum current and voltage ratings |
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Cable length |
Non-shielded: 150 m (492 ft) |
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Protection against short-circuit |
No |
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Terminal blocks |
Type: Screw, 7.62 mm (0.29 in.) pitch 2 rows are removable |
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NOTE: Refer to Protecting Outputs from Inductive Load Damage for additional information on this topic. |
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The following illustration shows the relay outputs de-rating curve:
NOTE: 50% de-rating when all the relay outputs are used at 55 °C (131 °F).
The following illustration shows the wiring diagram of the M218 controller's relay outputs:
(1) 4 A Type T fuse
(2) 2 A Type T fuse
NC Not Connected (N.C.)
(a) To improve the lifetime of the contacts, and to protect from potential damages by reverse EMF when using inductive load, it is recommended to connect:
oa free wheeling diode in parallel to each inductive DC load
oa RC snubber in parallel of each inductive AC load
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.
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UNINTENDED EQUIPMENT OPERATION |
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Do not connect wires to unused terminals and/or terminals indicated as “No Connection (N.C.)”. |
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Failure to follow these instructions can result in death, serious injury, or equipment damage. |
