Every Didactum measurement and control system is equipped with two 12V outputs. Connect the sensor's potential-free contact to these outputs. Then connect this sensor to the potential-free input of your "PAW-SERVER-PKEA" control unit using a two-wire signal cable. The monitoring system's German-language web interface then offers the following options:
- Manual switching on and off via the web GUI
- Interaction with our intelligent sensors (e.g., temperature sensor, humidity sensor, water leak sensor, smoke detector, etc.)
- Switching via SNMP command or via building management software (including Nagios, Icinga2, Check-MK, PRTG, Zabbix, etc.)
- SMS remote commands via mobile phone (GSM modem required)
Since the monitoring systems are equipped with potential-free input contacts, you can also continuously monitor the fault indicators of your air conditioning units, if desired. Fault messages are forwarded via syslog, email, SMS* (*via GSM/4G LTE modem), and SNNP traps. A dial-up function* is also supported. Audiovisual alerting is also available as an option.
Yes. Specify whether the normal state of the fault detector is open or closed. Then define the desired notifications, alarm messages, and actuator functions (siren or relay switching).
Yes. All Didactum monitoring units support the SNMP protocols v1, 2c, and v3 (encrypted). Every input contact on the unit can be queried via SNMP command over a TCP/IP network. Interval polling with support for SNMPwalk commands is also supported by the SNMP monitoring hardware.
If you need to control opto-isolated contacts via TCP/IP or SNMP, you can use the Didactum infrastructure monitoring systems:
- Monitoring System 500 (DC)
Potential-free contacts are primarily used in automation and building technology. With the support of a potential-free contact, also called a dry contact, operating states, fault messages, and diagnostic messages are transmitted (remotely). Systems and installations equipped with potential-free fault detectors include, for example:
- Frequency converters, DDC-GA
- Alarm systems, video surveillance systems
- Lighting control, door control, pump control
- Heating, ventilation, and air conditioning systems
- Air conditioners
- Fire alarm systems, extinguishing systems, sprinkler systems
- Safety switches, circuit breakers
- Fault signaling technology
- Switching relays, control cabinets
No. As the term "potential-free" suggests, no voltage or current may be applied to the input contacts of the Ethernet-based measuring and control device. Only connect pushbuttons, relays, or switches to these dry contacts.
The Didactum Monitoring System 300 was specifically designed for DIN rail mounting. Alternatively, you can order the Monitoring System 100 with a DIN rail mounting plate. This DIN rail mounting plate is simply screwed onto the bottom of the Monitoring System 100.
Every IP-based measuring and monitoring device from Didactum is supplied including the necessary Phoenix connectors for connecting the digital contacts / dry contacts.
Didactum's engineers deliberately chose this type of labeling. The number represents the dry contact input number (open), and the ground symbol indicates the ground connection (closed).
A dry contact functions like a switch. It can signal two states: Normally Open or Normally Closed. Every Didactum Ethernet-based measurement and control system can monitor dry contacts 24/7. Fault messages from connected air conditioners, ventilation systems, CO2 extinguishing systems, emergency diesel generators, load break switches, etc., are forwarded by the control system via email, SMS, SNMP trap, and syslog. Actuator functions, such as relay switching, are also supported.
No. Didactum's Ethernet-based remote control systems monitor dry contacts without the presence of current or voltage. Please ensure that the signal contacts to be monitored are indeed potential-free/current-free.
Yes. A 19-inch rack-mount kit is an integral part of the Dry Contact expansion unit's scope of delivery.
The inputs for potential-free contacts/dry contacts located directly on the mainboard of the Didactum monitoring systems are monitored with a polling interval of 100 ms. The fault signaling contacts connected to the internal expansion module of the 500 II fault signaling system are polled by the SPI with a polling interval of 2000 ms. The internal, IC2-controlled dry contact expansion boards of the Didactum 600/700 high-end remote control systems support a polling interval of 500 ms.
You can connect a switching relay with a potential-free normally open contact to one of the two 12V outputs of the TCP/IP-based Didactum monitoring system 100. Didactum customers have already successfully implemented this solution using the "Eltako R12-100" switching relay.
For connecting potential-free/digital contacts, please use a two-wire signal cable. Alternatively, you can use two wires from an RJ45 network patch cable. To do this, simply cut the CAT5/5e/6/7 patch cable open. Then connect this two-wire cable to the alarm contacts of your air conditioner and the potential-free connections of your Didactum monitoring system.
The hazard and alarm detection devices are equipped with 2 different connections for the Ethernet connection of potential-free / digital contacts.
You can connect a switching relay with a potential-free normally open contact to one of the two 12V outputs of the TCP/IP-based Didactum monitoring system 100. Didactum customers have already successfully implemented this solution using the "Eltako R12-100" switching relay.
Addendum:
For some time now, Didactum has also offered the tried-and-tested potential-free contact sensor. This sensor is simply connected to one of the two 12VDC output contacts of the IP-based measurement and control system. You can then conveniently define the desired actions (opening/closing) of the potential-free output switching contact in the web interface.
The IP-based Monitoring System 500 II from Didactum can monitor up to 128 dry contact alarms in real time. This is achieved by simply connecting expansion units, each with 64 alarm inputs. The system transmits the collected dry contact alarms via email or SMS (using a GSM/LTE modem or web-to-SMS server). Additionally, the switching status (open/closed) of the dry contact alarms is displayed in the tactical overview (German web interface).
The alarm alarms can also be remotely transmitted to automation software and/or building management systems via the SNMP (Simple Network Management Protocol) interface standard. Active checking of the collected alarm contacts is also supported. All events/switching operations of the connected dry contact alarms are recorded – including date and time – in the monitoring system's syslog database. The syslog can be sent at intervals via FTP upload or email and analyzed at the central control unit.
Many circuit breakers (MCBs) are also available with an auxiliary contact/trip signal switch to indicate the closed/closed status. Please contact a qualified electrical engineer or electrical contractor for further information.
Some manufacturers of protective switching devices also offer retrofittable residual current (RCD) modules. These modules use a potential-free contact to signal the tripping of the protective switching device to the networked Didactum monitoring system. Alarms can be sent by the Didactum system via email, SMS, and/or SNMP traps. Actuator functions (switching relays/sirens, etc.) are also supported.