GE GFK-1541B manual Status Bits Brief Description, Lan Ok

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Description of the Status Data

The errors and status reported in each type of status data are described below.

FT Output of the COMMREQ Function Block

The FT Output passes power upon the following errors:

ƒInvalid rack/slot specified. The module at this rack/slot is unable to receive a COMMREQ.

ƒInvalid Task ID.

ƒInvalid Data Block length (zero or greater than 128).

ƒToo many simultaneous active COMMREQs (overloading either the PLC CPU or the Ethernet Interface).

LAN Interface Status (LIS) Bits

The status bits occupy a single block of memory. The location of this block is specified during configuration of the Ethernet Interface. The first 16 bits of the block are the LAN Interface Status (LIS) bits. The next 64 bits are the Channel Status bits (2 for each channel).

Status Bits	Brief Description
1–7	Reserved
8	AAUI (90-30) fuse blown
9	Any SRTP Channel Error
10–12	Reserved
13	LAN OK
14	Resource problem
15	Reserved
16	LAN Interface OK
17	Connection Open - Channel 1
18	Reserved
...	...
47	Connection Open - Channel 16
48	Reserved
49 –80	Reserved for 90-30

Note

Unless the “LAN Interface OK” bit is set (Status Bit 16), the other status bits are invalid.

GFK-1541B Chapter 4 Programming Modbus/TCP Channel Commands 4-21