EM-M26 is an adjustable signal monitoring relay designed for standard voltage and current signals in industrial automation systems. It compares the measured input signal with an adjustable threshold and switches a potential-free relay contact when the selected switching condition is met.
The input range is selected using DIP switches. The switching threshold, hysteresis and ON/OFF delays can be adjusted from the top of the unit. The relay can be configured to activate either above or below the selected threshold.
The EM-M26 supports four standard industrial signal ranges:
The required input range is selected using the DIP switches. The voltage inputs have an input impedance of 1 MΩ, while the current input uses a 50 Ω input resistance.
The switching threshold can be adjusted from 0 to 110% of the selected input range. The extended adjustment range allows the threshold to be set slightly above the nominal full-scale signal.
Adjustable hysteresis from 0 to 10% helps prevent relay chatter when the input signal is close to the switching threshold.
The relay operating direction is selected using a DIP switch:
An LED indicates when the relay output is activated.
The relay response can be delayed independently when activating and releasing. Both the ON delay and OFF delay can be adjusted from 0 to 10 seconds.
The delays can be used to suppress short signal changes or prevent unnecessary relay operation caused by temporary process disturbances.
The relay output provides a potential-free changeover contact for connection to an external control, indication or alarm circuit.
A separate status-voltage output provides an immediate electrical indication of the comparison result. The status output is not affected by the configured ON or OFF delays and changes between approximately 0 V and 12 V.
The signal and supply circuitry have a specified isolation voltage of 500 V. The signal input includes overvoltage protection, while the supply input is protected against incorrect connection.
| Supply voltage | 15–30 VDC |
|---|---|
| Maximum current consumption | 60 mA |
| Voltage input range 1 | 0–1 V, input impedance 1 MΩ |
| Voltage input range 2 | 0–5 V, input impedance 1 MΩ |
| Voltage input range 3 | 0–10 V, input impedance 1 MΩ |
| Current input range | 0–20 mA, input resistance 50 Ω |
| Threshold adjustment | 0–110% of the selected input range |
| Hysteresis adjustment | 0–10% of the selected input range |
| ON delay | Adjustable 0–10 s |
| OFF delay | Adjustable 0–10 s |
| Relay operating mode | Greater than or less than |
| Relay contact type | Potential-free changeover contact |
| Relay contact rating | 1 A at 30 VDC / 0.5 A at 120 VAC |
| Status output | 0 V or 12 V through 2.2 kΩ |
| Isolation voltage | 500 V |
| Operating ambient temperature | 0 … +60 °C |
Ordering larger quantities +100pcs.
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