Frequently asked questions and answers for Field Networks - Industrial Automation
What cable lengths are sold for the cables used to wire the network between DeviceNet Master Units and DeviceNet Slaves?
There are two kinds of DeviceNet Cable: DCA2-5C10 (Thick Cable) and DCN1-5C10 (Thin Cable). These Cables are sold in 100-m increments.
Is it acceptable to combine SRT1 Slaves and SRT2 Slaves in a CompoBus/S system?
These Slaves can be combined, but only when the high-speed communications mode is used. They cannot be combined when long-distance mode is being used.
The two kinds of Slaves cannot be combined in long distance mode because the SRT2-series Slaves can be switched between long-distance mode and high-speed mode, but the SRT1-series Slaves support only high-speed mode.
What is the difference between methods to use a terminating resistor attached to the T-branch Tap or a Terminal Block style terminating resistor of the DeviceNet?
It differs by whether the T-branch Tap "DCN1-1C" and/or "DCN1-3C" is located within 6m or more than 6m far from a node of the main line.
If it is located within 6m from a node of the main line, a supplied terminating resistor can be attached to the T-branch Tap.
If it is located more than 6m far from a node of the main line, a terminating resistor must be attached to the end of the node.
In this case, the T-branch Tap fitted with a terminating resistor or the Terminal Block style terminating resistor DRST-1 must be connected. The maximum cable length between the node and the terminating resistor is 1m.