SMC Networks EX510-GPR1 Series Operation Manual page 62

Option
•Branch cable
It is a 4-core flat cable used for connection between each unit.
•Branch connector (Every 1 pc.)
It is a connector used to connect the branch cable to each unit.
SI unit and Input unit are attached with the branch connector for 2 pcs. each.
•Cable assembly for output entry
It is a cable assembly to take the remaining output of the SI unit out of it.
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No.EX##-OMI0032-C