DFS251I hh.mm.ss CONTROL UNIT INOPERABLE LINE x PTERM y-z aa,bbbb,cc,dd,ee,ff,gg,hh, iiii,jjjj
Explanation
A remote control unit for one or more devices has become inoperable. All terminals associated with the failing control unit have been stopped. See information about the z/OS® system error message IEA000I for line and TCU errors or IMS error message DFS973I for 3270 device errors.
Attention: IMS no longer supports BTAM
terminals.
The following
description applies to remote 3270 devices:
- Code
- Meaning
- y-z
- This field gives the range of PTERMs that are connected to the control unit.
- aa
- This field contains the ECB completion code.
- bbbb
- The DECTYPE field indicates the type of failing operation.
- cc
- The DECTPCOD field indicates the data communication operation code from the last CCW run in the channel program.
- dd
- The DECFLAGS field contains the flag byte passed to IMS from BTAM. The field might contain information as to the cause of the failure.
- ee
- The DECSENS0 field contains the sense information from the DECB if the status in the CSW indicates a unit check.
- ff
- The DECERRST is the error status field from the DECB.
- gg
- The DECCSWST is the CSW status field from the DECB.
- hh
- This field contains the device-dependent module code. When the 3270 device-dependent modules shut down a component of the data communication network, a device-dependent module reason code indicates why the device-dependent module shut down the component. The device-dependent module codes are described below.
- iiii
- This field contains the BSCK return code. The code is passed from
the BSC check routine (DFSBSCK0) to the device-dependent module. The
BSC check routine analyzes the I/O completion and passes a unique
return code to the device-dependent module, depending on the contents
of the DECB fields. Note: A BSCK return code of X'0108' is set for a selection timeout from the remote control unit. If a port does not exist, a /START command must be issued which does not include the unavailable PTERMS.
- jjjj
- This field contains the SENSE/STATUS information from the 3270 device (if applicable). See IBM 3270 Information Display System for an explanation of the SENSE/STATUS codes.
The device-dependent module codes (field hh)
have the following meanings:
- Code (Dec)
- Meaning
- 01
- Data received did not start with start-of-text/start-of-header (STX/SOH) or did not end with end-of-transmission block (ETB) or end-of text (ETX).
- 02
- An invalid attention-identification (AID) character was received from the 3270.
- 03
- One of the following occurred:
- Start/stop (S/S) READ was performed, but data other than an S/S message was received.
- Fewer than 9 bytes were read on an S/S READ.
- S/S message did not have STX character in correct place.
- Device address in S/S message does not match device address in communication terminal block (CTB).
- 04
- Invalid return code passed back in CLBTEMP5 from DFSBSCK0.
- 05
- Invalid S/S combination received.
- 06
- S/S related to a copy operation was received. However, no copy operation was in progress, or an error occurred on copy operation and device-dependent module found invalid DECTYPE or data stream.
- 07
- Interrupt request invalidly received from the 3275 video display.
- 08
- Device end S/S message received, but device-dependent module is not in READ setup or READ interrupt logic.
- 09
- Fewer than 5 bytes were read.
- 10
- Device address in data stream was invalid for a device on this control unit or line.
- 11
- Retries exhausted on temporary error.