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GFK-1541B Chapter 4 Programming Modbus/TCP Channel Commands 4-21
4
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:
Invalid rack/slot specified. The module at this rack/slot is unable to receive a COMMREQ.
Invalid Task ID.
Invalid Data Block length (zero or greater than 128).
Too 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.