1. Introduction
GEM80-400
Page 1-28
ALSPA GEM80-400 CONTROLLER TECHNICAL MANUAL
Issue 3 04/99
Controllers which are executing, accept on-line program changes, but the
controller will freeze all outputs and ignore all inputs for approximately 1
milliseconds per 1000 instructions on recompilation with large programs.
Note...
(1) The controller cannot tell whether the program change is safe and
simply carries out the instructions given.
(2) Recompilation can cause problems when modules such as counters are
incorporated in a system. It is the user's responsibility to ensure the safe
operation of plant equipment when this facility is utilised.
1.15.7.
Testing a GEM
80 System
In test modes, GEM
80 output signals must be disconnected or in some way
deactivated to prevent accidental mobilisation of plant and machinery, or
other possible hazards.
1.15.8.
Watchdog and Safety Circuits
The requirements for watchdog and safety circuits of Chapter 11 must be
designed into the system.
1.15.9.
System Status Indication
When the green LEDs labelled WDA, WDB, and RUN on the front panel display
of the processor module are illuminated, the controller is running the user
program and may be controlling moving machinery.
The four-character alphanumeric display provides the user with the following
indications:
Run
-
System running
Halt
-
System halted
#nnn -
Fault shutdown (nnn = error number)
!nnn
-
User watchdog trip (nnn = user error code)
Test
-
Full system self test
TRun
-
Run, Test Inputs
THlt
-
Halted, Test Inputs
BATT
-
Battery low warning
BOOT -
System checks that main code is present and correct.
F/W
-
Controller is in Firmware update mode; all GEM
80 functions
are suspended.
1.16. GEM
80 Batteries - Safety Precautions for Disposal and Handling
