Honeywell 7800 Series Installation Instructions Manual page 39

The optional Keyboard Display Module displays sequence
status messages indicating: STANDBY, PREPURGE, PILOT
IGN, MAIN IGN, RUN and POSTPURGE. The selectable
messages also provide visual indication, current status
and historical status of the equipment such as: Flame
Signal, Total Cycles, Total Hours, Fault History, Diagnostic
Information and Expanded Annunciator Terminal Status
(if used). With this information, most problems can be
diagnosed without extensive trial and error testing. Data
available in the Diagnostic Information file includes:
Device Type, Device Suffix, Software Revision,
Manufacturing Code, Flame Amplifier Type, Flame Failure
Response Time, Selectable Jumper Configuration Status,
Run/ Test Switch Status and Terminal Status.
Diagnostic Information Index
The RM7888A with the optional Keyboard Display Module
can monitor input/output terminals and can display the
status of the terminal at the VFD (for example, Pilot Valve
T8 ON<), see S7800A1001 Keyboard Display Module
Specifications. A complete terminal description and
number are provided. The display will show the actual
status of the terminal. If voltage is detected at the
terminal, ON is displayed; but if no voltage is detected at
the terminal, OFF is displayed.
Historical Information Index
The RM7888A has nonvolatile memory that allows the
Relay Module to retain historical information for the six
most recent lockouts. Each of the six lockout files retains
the cycle when the fault occurred, the hour of operation
when the fault occurred, the fault message and burner
status when the fault occurred. See the S7800A1001
Keyboard Display Module Specifications.
NOTE: A Lockout condition or restart of an RM7888A
can be accomplished by pressing the reset push-
button on the RM7888A, or pressing a remote
reset pushbutton wired through an optional Key-
board Display Module, DATA CONTROLBUS
MODULE™, Modbus module, Extension cable
Assembly, or Remote Reset Module. A powerup
reset will cause an electrical reset of the
RM7888A but will not reset a Lockout condition.
NOTE: Remove the access slot covers on the sides of the
Q7800A,B to check voltage.
RM7888A 7800 SERIES RELAY MODULE
CAUTION
Reinstall access slot covers on the Q7800A,B
subbase after performing voltage checks.
NOTE: Maximum ambient operating temperature of a
C7012E,F Series 1 through 6 will be reduced to
125° F because of the duty cycle operation of the
RM7888A Relay Module.
Sequence and Status Hold
Messages
Refer to Tables 7 and 9 for sequence display information.
SAFETY AND SECURITY
Physical device protection
Device shall be accessible to authorized personnel only –
Installation on publicly accessible places is not
recommended as this could lead to unwanted and
potentially unsafe changes to device (wiring,
configuration, etc).
It is recommended to lock the device in an enclosed
cabinet with access allowed only to approved and trained
personnel. Also, it is strongly advised to keep all the wiring
of device physically secure.
Physical protection of the device is applied via Run/Test
switch label/seal. It is intended to prevent and detect
unauthorized access.
Modbus & DDL Interface security
Any conducts critical to device functionality (DDL,
Modbus lines etc.) shall be physically protected (installed
outside public access) since they could be damaged or
tampered-with by unauthorized people, either
accidentally or for purpose.
Modbus RS-485 & DDL protocols do not support security
features. For DDL interface - only DDL devices shall be
connected to the Burner Controller DDL line.
License agreement
Copying and reverse engineering is prohibited by the law.
39 32-00214—01