PCC-IV Instruction Manual (rev. 0.1)
Page 4-5
Section 4
–
Menu Operations
Service Manual Menu
What is "Service Manual" (S/M) Mode?
Normal Operation: During normal operation, an
AOUT
(or
TOUT
) Block converts a
blockware 0-100% input signal into a proportional 4-20 mA (or Triac) hardware output
every scan (1/10 second). Normal operation continues uninterrupted, regardless of
the front panel display mode, process mode, or annunciator mode.
Most PCC-IV controller blockware control strategies have an
“Auto / Manual” station
on the front panel. During normal operation, both Auto and Manual modes rely on the
blockware to regulate the 4-20 mA or Triac output channels. Manual mode does not
bypass the output channel blockware (i.e., AOUT or TOUT) and does not directly
regulate the output hardware.
Service Manual (S/M): During S/M mode, a 4-20 mA (or Triac) output channel is
directly controlled using the permanently programmed firmware ROM, instead of the
blockware logic. In fact, the blockware memory can be erased or corrupted, and the
operator will still be able to manually regulate the PCC-IV 4-20 mA and Triac outputs.
The firmware ROM is factory programmed, and cannot be erased or corrupted by the user.
Relay outputs and sinking discrete outputs are always controlled by the blockware. S/M mode has no effect on
these.
When an output channel enters S/M mode, the output remains at the last value, unless the operator uses the special
S
ervice Manual “Change One Output” submenu to change the output.
The primary reason for using the Service Manual mode is to prevent the 4-20 mA and/or Triac outputs from changing
when the user is writing new blockware or for troubleshooting.
S/M mode can be activated from the Service Manual menu. All outputs can be placed in S/M or Auto, and an
individual output channel
can be changed via the “Change One Output” submenu. The output channels can all be
in Auto operation mode, all in S/M mode, or in any combination of modes. However, PCC-IV will automatically put
all output channels into the S/M mode if any of the self-diagnostic tests detect a problem.
The PCC-IV will not de-activate S/M mode automatically. The user must manually de-activate S/M mode from the
Service Manual menu.
The RUN light indicates Normal, Forced, or S/M Mode
Green RUN Light ON / OFF Cycle
Operating Mode
ON Continuous
Normal
Flashing
– Blinks OFF once every second
Forced Block(s)
Flashing
– Blinks ON twice every second
Service Manual
OFF Continuous
Not Operating
Note: S/M Mode RUN light indication takes priority over FORCED Mode
indication when both S/M and FORCED Modes are active.
WARNING
The PCC-IV is commonly used to control potentially dangerous Combustion and Chemical
Processes. VERIFY THAT THE PROCESS BEING CONTROLLED HAS BEEN SAFELY
SECURED, ISOLATED, OR BYPASSED (AS REQUIRED BY THE SITE CONDITIONS)
BEFORE PUTTING THE PCC-IV CONTROLLER INTO SERVICE MANUAL MODE.
FAILURE
TO DO SO CAN RESULT IN EQUIPMENT DAMAGE, INJURY, OR DEATH.
WHEN A PCC-IV OUTPUT IS IN THE SERVICE MANUAL MODE,
THE OPERATOR HAS
TOTAL RESPONSIBILITY TO ENSURE THAT ALL EQUIPMENT IS OPERATED SAFELY.
