Concept
Triac Outputs
The triac outputs can be used in many applications to switch 24 VAC on or off for external loads such as actuators, relays, or indicators. Triacs are silent and do not suffer from relay contact wear.
The outputs can be configured as one of the following types:
Digital output
Digital pulsed output
Pulse width modulated output
Tristate output
Tristate pulsed output
Outputs
The DO triac outputs are designed to switch 24 VAC. The common terminals can be connected to 24 VAC or to ground. The DO triac outputs share common terminals as follows:
DO1 and DO2 share common terminal COM1 (on MP-C-15A, -18A, and -18B).
DO3 and DO4 share common terminal COM2 (on MP-C-15A, -18A, and -18B).
DO5 and DO6 share common terminal COM3 (on MP-C-15A and -18B).
DO7 and DO8 share common terminal COM4 (on MP-C-18B).
The terminals are opto-isolated from the controller.
R V1 and R V2 are varistors (95 V, 2 J) for protection of the triac.
R 1 = 47 ohm
C 1 = 22 nF
Optionally, to protect the triac outputs from damage in the event of external wiring short circuit, you can connect an in-line fuse (3 A) in series with the COM terminal.
Specifications
Channels, MP-C-15A
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6, DO1 to DO6
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Channels, MP-C-18A
|
4, DO1 to DO4
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Channels, MP-C-18B
|
8, DO1 to DO8
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Channels, MP-C-24A
|
0
|
Channels, MP-C-36A
|
0
|
Output rating (for each triac output)
|
Max. 0.5 A
|
Voltage
|
24 VAC +/-20 %
|
Commons
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COM1 for DO1 and DO2 (on MP-C-15A, -18A, -18B)
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COM2 for DO3 and DO4 (on MP-C-15A, -18A, -18B)
|
|
COM3 for DO5 and DO6 (on MP-C-15A, -18B)
|
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COM4 for DO7 and DO8 (on MP-C-18B only)
|
|
| The common terminals can be connected to 24 VAC or to ground. | |
Common voltage, high side output
|
24 VAC
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Common voltage, low side output
|
0 VAC (ground)
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Minimum pulse width
|
100 ms
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Triac output protection
|
MOV and snubber across each triac output
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MOV from triac COM to ground
|
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MP-Cs
MP-C Onboard I/O