EM-M40H is an eight-channel alarm logic module designed for alarm monitoring and indication in industrial automation systems. It provides the essential functions required for building alarm panels and centralized fault indication systems.
Each alarm channel can be individually configured to activate when a contact opens or closes. The inputs can also be controlled using voltage signals. Dedicated indication outputs follow the input states in real time and can be used to control external signal lamps, LEDs or relays.
When an alarm condition is detected, the indication output of the corresponding channel begins to flash. At the same time, the group alarm relay and alarm output indicate a common alarm condition.
The alarm is latched so that temporary faults are not overlooked. If the input returns to its normal state before the alarm is reset, the alarm indication remains active until it is cleared using the reset function.
When an active alarm is acknowledged, the common group alarm is cleared. The indication for the affected channel remains continuously illuminated until the input returns to its normal state. A new, unacknowledged alarm flashes, while an acknowledged alarm that is still active remains steadily illuminated.
Each of the eight alarm inputs can be configured for activation by either an opening or closing contact. The inputs also accept voltage control signals using the specified low and high logic levels.
The indication outputs can operate either directly or with inverted logic. In direct operation, the output follows the corresponding input state. In inverted operation, the output state is reversed relative to the input.
A common input delay can be adjusted from 1 to 8 seconds. The delay helps prevent short signal disturbances from generating unnecessary alarms.
The group alarm relay output has a separate adjustable delay from 0 to 15 seconds. Both delay settings are common to all eight alarm channels.
The EM-M40H provides three types of common alarm output:
The group alarm relay is energized during normal operation and de-energized when an alarm occurs. This fail-safe operating principle also allows a loss of supply voltage to be detected as an alarm condition by the external system.
The test input can be used to verify the operation of the alarm indications and outputs. The group alarm relay can be excluded from the test when activation of the external alarm circuit is not desired during routine testing.
All NPN transistor outputs are protected against short circuits and overloads. Normal operation resumes automatically after the fault condition has been removed. The supply input is protected against voltage transients and reverse polarity.
| Supply voltage | 12–32 VDC |
|---|---|
| Current consumption | 100 mA |
| Number of alarm channels | 8 |
| Input logic level, low | < 1 V |
| Input logic level, high | > 4 V |
| Maximum input voltage | ±35 V |
| Input impedance | 4.7 kΩ (inputs 1–8) |
| Input delay | 1–8 s |
| Group alarm relay delay | 0–15 s |
| Relay contact rating | 1 A at 125 VAC / 1 A at 30 VDC |
| Transistor output type | NPN open collector |
| Transistor output load capacity | 100 mA (Uout < 1 V) |
| Output overcurrent protection | typ. 120 mA |
| Operating ambient temperature | 0 … +50 °C |
| Housing dimensions | 97 × 133 × 35.5 mm |
| Compliance | EMC tested and CE marked |
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