Link Special Relay (Sb) - Mitsubishi Electric melsec q00ujcpu User Manual

Programmable controller

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Link special relay (SB)

(1) Definition

The Link special relay (SB) is a relay that indicates various communication status and detected errors of

intelligent function modules such as CC-Link IE controller modules or MELSECNET/H network modules.

Each of this device area is turned on or off according to a factor occurred during data link.

The communication status and errors on the network can be confirmed by monitoring the link special relay (SB).

(2) Number of link special relay points

The points for the link special relay in the CPU module is 2048. (SB0 to SB7FF).

However, the points can be changed in the Device tab of the PLC parameter dialog box. (

To an intelligent function module that has a link special relay, such as a CC-Link IE controller module or

MELSECNET/H network module, 512 points are assigned.

Assigning the link special relay as shown in Figure 9.20 allows refresh of the CC-Link link special relay (SB) to the

link special relay (SB) of the CPU module.

For details of the link special relay, refer to the manual for an intelligent function module that has the link special relay.

Link special relay

For 1st network module

For 2nd network module

For 3rd network module

For 4th network module

For 1st CC-Link module

Figure 9.20 Points of the link special relay

Section 9.1)