89
LEDs and buzzer
When TEST is pressed, the LEDs light up and the buzzers sounds
intermittently for five seconds.
Save RAM in Flash
With this function you can save the content of the RAM in a Flash
memory if there is one.
I
2
C-link faults on PACS 3000 modules.
I
2
C stands for “Inter-IC” and is a link with two conductors for efficient
inter-IC control.
I
2
C is the communication link between the PACS 3000 CPU and the
modules (AI, AO, DI and DO) connected to the CPU. The I
2
C-link is
serial. It begins with the CPU and end with the last module.
IO error alarm
When a communication error occurs between the CPU and an input or
output module defined in the software, an alarm is given. The alarm is
a sum alarm for all I
2
C communication.
Possible I
2
C faults:
1. The I
2
C component in a module is faulty.
A faulty I
2
C component or the lack of a power supply to the module
may completely disable communication.
2. Cable break between the modules.
Because serial communication is used, a cable break anywhere
along the chain causes a fault in the connection for all modules
beyond the break.
3. The DIP-switch address settings are wrong.
DIP-switch settings on PACS 3000 modules
Every PACS 3000 input and output module has a four-pole DIP- switch
for setting the IO-address of the module. The binary number system in
the table below shows the module address number system.
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