Hi all,
I am experiencing a very weird trouble with Wago 841.
System works fine, and is connected to two 750-342 couplers
(the 841 reads and writes them using Modbus UDP), and
to an HMI device (still Modbus, but TCP) protcol.
Everything looks allright, untill I try to use HTTP.
The 841, for those not knowing it, can hold inside of
its flash memory a set of HTML pages and you can upload them
using FTP protocol. I did quite a big work to design all
the pages, using pure HTML, Javascript, some small images (all
stored inside the 841) and the SSI system (server side includes).
The SSI is the only way to dialog with PLC memory (All %M locations
for me). The pages just get data (words, double words, bytes)
and, with some forms, do post some other data modifying
settings. Basically I do a supervision just browing the PLC.
Everything looks ok, untill something bad happens and the PLC
just CRASHES. Most of the led lights on the coupler start to
flash (between red and green) and there's no way to gain
control: I need to shut down the coupler and power up it again.
It seems to me that the more complex a page is (hence more
data, hence more SSI calls), the easier it crashes.
Anybody experienced this ??? I am in trouble since I've already
TWO system installed, and I cannot gain time anymore delaying
the end of works document delivery.
WAGO claims nothing happens, even if they're providing a new
kernel. New kernel should contain upgrades for threads programming
(that I don't use), and there should be nothing about HTTP.
I tried messing with the Watchdog timers and setting, but w/o
success. First I don't know how all the setting (mostly the
flags) work (manual ain't clear), and second wago claims those
settings are all modbus related.
Any help MUCH apreciated.
Thanx
Luca
I am experiencing a very weird trouble with Wago 841.
System works fine, and is connected to two 750-342 couplers
(the 841 reads and writes them using Modbus UDP), and
to an HMI device (still Modbus, but TCP) protcol.
Everything looks allright, untill I try to use HTTP.
The 841, for those not knowing it, can hold inside of
its flash memory a set of HTML pages and you can upload them
using FTP protocol. I did quite a big work to design all
the pages, using pure HTML, Javascript, some small images (all
stored inside the 841) and the SSI system (server side includes).
The SSI is the only way to dialog with PLC memory (All %M locations
for me). The pages just get data (words, double words, bytes)
and, with some forms, do post some other data modifying
settings. Basically I do a supervision just browing the PLC.
Everything looks ok, untill something bad happens and the PLC
just CRASHES. Most of the led lights on the coupler start to
flash (between red and green) and there's no way to gain
control: I need to shut down the coupler and power up it again.
It seems to me that the more complex a page is (hence more
data, hence more SSI calls), the easier it crashes.
Anybody experienced this ??? I am in trouble since I've already
TWO system installed, and I cannot gain time anymore delaying
the end of works document delivery.
WAGO claims nothing happens, even if they're providing a new
kernel. New kernel should contain upgrades for threads programming
(that I don't use), and there should be nothing about HTTP.
I tried messing with the Watchdog timers and setting, but w/o
success. First I don't know how all the setting (mostly the
flags) work (manual ain't clear), and second wago claims those
settings are all modbus related.
Any help MUCH apreciated.
Thanx
Luca