Interprocessor Communication (IPC)
60 RTHC-SVD01B-EN
2. Report a diagnostic to the 1U1 (over the IPC link).
The 1U1 (if it properly receives such) will then report and display the
diagnostic on the Clear Language Display. The diagnostic will:
1. Identify which module is reporting the communication problem.
2. Identify which module was to have sent the missing information.
The 1U1 will then send out further commands to the other modules to
shutdown or take default actions as the particular case may warrant.
All IPC diagnostics are displayed in the Clear Language Display's
diagnostics section. For example, “Chiller: Loss of Comm with
Options” indicates that the 1U1 has detected a loss of IPC communica-
tion from the Options 1U5 module. When some problem exists with the
IPC link or a module fails, it is common for more than one of these IPC
diagnostics to be displayed. Note that only those diagnostics that are
indicated to be active currently exist. All other historic diagnostics
should be disregarded for the purpose of the following troubleshooting
discussion.
12-3. Troubleshooting Modules Using IPC
Diagnostics
Communication problems can result from any of the following:
1. Opens or shorts in the twisted pair IPC wiring or connectors
2. Loss of power to a module
3. Internal module failure
4. Incorrect polarity
5. High levels of EMI (Electro-Magnetic Interference)
6. Module specific function selected without the Options module.
7. Loss of ground
These are discussed in more detail in the following paragraphs.
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