ONLINE ELECTRONICS LTD
ID5000P_5001_A01 Page 15 of 18
5.1. STANDARD TERMINAL PCB
This is the standard TERMINAL PCB fitted to the unit. It provides connections for external
power, relay output, and a current loop output.
All connections are made to the PCB using 3.5mm pitch removable terminal blocks which can
accept wire sizes up to 1.5mm
2
. Connections are clearly labelled on the PCB and are connected
to a TERMINAL BLOCK using the wire colours shown below.
COM - Common contact of relay
NC - Normally Closed contact of relay
NO - Normally Open contact of relay
EXT - Positive side of external 24VDC supply
GND - Negative side of external 24VDC supply
Tx - Do not use this connection
Rx - Do not use this connection
SGND - Do not use this connection
CL+ - Positive side of current loop 24VDC supply
CL- - Negative side of current loop 24VDC supply
Refer to sections 3.5 RELAY OUTPUT and 3.6 CURRENT LOOP OUTPUT. All power supplies must
provide between 23.0VDC and 25.0VDC. A single power supply may be shared for the positive
side of external supply and the positive side of the current loop supply.
5.2. HEATER PCB OPTION
The HEATER PCB is fitted when low temperature operation is required (-40°C to -20°C). It also
provides connections for external power and relay output. There is no provision for a current
loop output. The HEATER PCB should only be used with an EXTERNAL POWER SUPPLY. Use
with a battery pack is not recommended.
All connections are made to the PCB using 3.5mm pitch removable terminal blocks which can
accept wire sizes up to 1.5mm
2
. Connections are clearly labelled on the PCB and are connected
to a TERMINAL BLOCK using the wire colours shown below.
COM1 - Common contact of relay 1
NC1 - Normally Closed contact of relay 1
NO1 - Normally Open contact of relay 1
COM2 - Common contact for relay 2
NC2 - Normally Closed contact of relay 2
NO2 - Normally Open contact of relay 2
VEXT - Positive side of external 24VDC supply
GND - Negative side of external 24VDC supply
HTR+ - Positive side of heater 24VDC supply
HTR- - Negative side of heater 24VDC supply
Refer to sections 3.5 RELAY OUTPUT and 3.6 CURRENT LOOP OUTPUT. All power supplies must
provide between 23.0VDC and 25.0VDC. A single power supply may be shared for external
power and the heater.
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