cisco_kid
Member
I have inherited an existing project, about 8 years old, at a chemical plant (think, Class 1, Div 2 environment). I cannot identify this device. It is some sort of fused terminal block, from the fuse symbol. Could it be a disconnect term?
http://radar.net/see/2293822
9A - 24VDC from power supply
9HO - 24VDC to input device
9HI - 24VDC from input device
9B - 24VDC to PLC input
This same block is used for outputs also. The PLC I/O is always passed through the "mystery symbol".
My guess is that this is related to grounding, surge or spark suppression. However, I have not been able to locate this symbol anywhere on the net, and I can't get the part number for the block itself.
Thanks for your assistance!
http://radar.net/see/2293822
9A - 24VDC from power supply
9HO - 24VDC to input device
9HI - 24VDC from input device
9B - 24VDC to PLC input
This same block is used for outputs also. The PLC I/O is always passed through the "mystery symbol".
My guess is that this is related to grounding, surge or spark suppression. However, I have not been able to locate this symbol anywhere on the net, and I can't get the part number for the block itself.
Thanks for your assistance!