Emerson 2468CD Manuel D’Utilisation

Hydrastep 2468CB & 2468CD Manual  

Opto-isolated Output Board Option 

The Opto-isolated Output Board (PCB 24680505) has four opto-isolated outputs and is 
mounted on top of the input board using 3 nylon spacers.  Electrical connection between the 
two boards is via a plug and a socket (SK1 on the input board and PL1 on the opto-isolated 
output board). 
 
A second opto-isolated output board may be mounted on top of the first on spacers.  Holes 
have been drilled on all opto-isolated output boards to receive the 3 nylon spacers.  The top 
output board is offset towards the centre of the unit improving the cable layout from the  
opto-isolated output boards.  The spacer fixing holes and mounting holes are illustrated in 
Figure 3c.1 (on page 3c-6). 
 
Note: The 

term 

energised is used to describe the ON (low resistance) state of the opto- 

isolated output. 

 
Each of the opto-isolated outputs can be energised by any one of up to 16 electrodes, with 
an individual choice of being energised when its selected electrode is in steam or is in 
water.  Furthermore, opto-isolated output 1 can be used to monitor an electrode state or to 
register an ALARM condition.  When set to register the ALARM state, the opto-isolated 
output is energised in the ‘system normal’ state and de-energised when an ALARM 
condition exists. 
 
This option comes complete with the nylon spacers and two 8-way output sockets. 
 

This sub-section deals with the mechanical and electrical installation of the Opto-isolated 
Output Board (PCB 24680505) option.  In the rest of this chapter the ‘opto-isolated output 
board’ title is shortened to ‘output board’. 
 

The storage area must be dry, dust-free and kept at a reasonable temperature.  The storage 
area should allow for access and inspection of all items of equipment. 
 

Open the option package and inspect the contents for signs of damage.  Check contents for 
completeness.