Honeywell CIU 888 - Page 62

Getting Started
Part No.: 4417584_Rev12 Configuration Manual
CIU 888 3 - 32
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You can view or edit these properties:
NOTE 1: BPM field card is used to interface with the Honeywell Enraf BPM field bus
devices and RS-232C/RS485 field card is used to interface with the downlink
CIU 880 / CIU 888 / CIU 858 and third party Modbus field devices. The TRL/2
field card is used to interface with the Honeywell TRL/2 gauges and Rex
gauges.
NOTE 2: If Protocol type is Modbus RTU / CIU-GPU, configure Field port tab and RS
Field Port tab. If Protocol type is BPM-GPU, configure Field port tab and BPM
Field Port.
If Protocol type is Modbus TRL/2, configure Field port tab and TRL/
2 Field Port tab.
NOTE 3: When a field communication fails it is possible to maintain last valid scan data
in the CIU 888 database during a configurable amount of time. The
communication fail delay mechanism is reset on the reception of data.
For Example:
- modem delays bad cabling.
- no answer because of re-initializing gauge.
NOTE 4: When a data fails it is possible to maintain the last valid scan data in the CIU
888 database during a configurable amount of time. The data fail mechanism is
reset on the reception of valid data.
For Example:
- re-initialization of a gauge.
- 802/811 digitizer failure.
NOTE 5: The setting in ‘Poll strategy’ determines the sequence in which the Field ports
are scanned:
PPPPPP = all ports scan parallel (= default).
P11111 = port 1 scans parallel, others scan sequentially.
112233 = ports 1 & 2, ports 3 & 4 and ports 5 & 6 scan in a separate sequence.
Properties Description
Communication fail delay Enter a time between 0 and 255 seconds (default = 60).
See Note 3.
Data fail delay Enter a time between 0 and 255 seconds (default = 60).
See Note 4.
Poll strategy Select P, 1, 2, or 3.
See Note 5.
Protocol Type Select None, Modbus RTU (= RS-Communication),
CIU-GPU (= RS-Communication), or BPM-GPU
(= Honeywell Bi-Phase Mark) or Modbus TRL/2. See
Note 1 and Note 2.
Field port option slot Select Option Slot 1, Option Slot 2, Option Slot 3,
Option Slot 4, Option Slot 5, or Option Slot 6.