I

I/O-Modules
Fox Series
MDR-8, Digital Output Relay Sub-module

Product Description

The MDR-8 output module is a submodule, which is galvanically decoupled by means of optocouplers, for the CNX21 base module. The submodule provides eight digital outputs. For operation in the II/O system, you can install up to four MDR-8s in the four slots of a CNX21 base module. This makes possible a maximum of 32 outputs per CNX21. In addition, you can combine MDR-8s with different modules, e.g. digital inputs.

Per output, there are available on the connectors a normally closed contact, a mid-position contact and a normally open contact.

To protect the relay contacts, the system short-circuits the voltage peaks, which occur at the NO or NC contact when inductive loads switch, via varistors to the front connectors designated N. The MDR-8 is provided for a 110V switching voltage. The breakdown voltage of the varistors mentioned above is matched to the switching voltage. For reasons of interference protection, it is, however, sensible to directly suppress the interference of inductive consumers.

If the MDR-8 is used to switch 110V, you must connect the protective earth to the appropriate connection.

The relays used have a rated test voltage of 3000 VAC and a surge withstand capability of 5000V between the contact and the coil, i.e. between the load current circuit and the 24V system voltage. If this dielectric strength is insufficient with 110V applications, relays with greater dielectric strength are available on request.

Note:
Since the relay needs a coil voltage of at least 20V to pick up, the CNX21 operating voltage range is limited to 24V -15% / +20% when the MDR-8 is being used.

Technical data	MDR-8
MDR-8 Outputs	8 relay outputs, galvanically decoupled 8 LED output status indicators 1 LED voltage indicator
Outputs	NC (Normally Closed) contact, mid-position contact, NO (Normally Open) contact
Relay Data	Switching voltage: 0.1 - 220V Switching current: 1A Switching cycle: 110^5 ...510^7 test voltage Contact/coil: 3000VAC impulse voltage Contact/coil: 5000V
Contact Protector	Varistor between NO or NC contact and corresponding N connections Varistor data: Wtm (10/1000us) 0.8J Itm (8/20us) 100A Um (ac) 110V Version 163V 220V Version 253V
Output Monitoring	Watchdog Circuit
Supply Voltage	5V/ 0.02 A; 24V / 140 mA (relay coil current)
Current Consumption	System voltage: 20 mA Switching voltage: 80 mA (without load currents)
Housing	Module with front panel is mounted in the CNX21 using two screws
Dimensions (WxHxD)	58 * 72 * 50 mm
Weight approx.	300 g
Operating temperature	0°C ... +55°C
Storage temperature	-20°C ... +70°C

Signal Description

Pin	Signal	I/O	Description
L-1	s1	Out	NO contact, relay 1
L-2	m1	Out	Mid-position contact, relay 1
L-3	o1	Out	NC contact, relay 1
L-4	s2	Out	NO contact, relay 2
L-5	m2	Out	Mid-position contact, relay 2
L-6	o2	Out	NC contact, relay 2
L-7	s3	Out	NO contact, relay 3
L-8	m3	Out	Mid-position contact, relay 3
L-9	o3	Out	NC contact, relay 3

M-1	s4	Out	NO contact, relay 4
M-2	m4	Out	Mid-position contact, relay 4
M-3	o4	Out	NC contact, relay 4
M-4	s5	Out	NO contact, relay 5
M-5	m5	Out	Mid-position contact, relay 5
M-6	o5	Out	NC contact, relay 5
M-7	s6	Out	NO contact, relay 6
M-8	m6	Out	Mid-position contact, relay 6
M-9	o6	Out	NC contact, relay 6

R-1	s7	Out	NO contact, relay 7
R-2	m7	Out	Mid-position contact, relay 7
R-3	o7	Out	NC contact, relay 7
R-4	s8	Out	NO contact, relay 8
R-5	m8	Out	Mid-position contact, relay 8
R-6	o8	Out	NC contact, relay 8
R-7	N	Input	Conductor for contact protection, relay 1..3
R-8	N	Input	Conductor for contact protection, relay 4..6
R-9	N	Input	Conductor for contact protection, relay 7..8

Pin designations: L = left-hand row R = right-hand row M = middle-hand row

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