F. Restore beamline after a power outage

Note

This section was started after the scheduled power shutdown of April 20, 2024. I am trying to capture the things I did to bring the beamline back to life that seemed non-obvious or were a source of friction. YMMV and this section should be expanded in the future.

F.1. Channel Access

By default, channel access security is set such that access to beamline PVs is disabled. This means that motors cannot be moved, detectors cannot be triggered, and so on.

To enable channel access, do the following:

caget XF:06BM-CT{}Prmt:RemoteExp-Sel 1

Thus must be done as yourself, not as the beamline operator account.

If that PV is being reported as disconnected – which is indicated by the “Workstation Access” buttons on the BMM Main CSS screen or by the command above returning Channel connect timed out – then you need to restart the CAS Switch IOC.

To do that, ssh to xf06bm-ioc2 as youself (not as the operator account) and do

dzdo manage-iocs restart cas-switch

Once that IOC restarts, try again to set XF:06BM-CT{}Prmt:RemoteExp-Sel.

F.2. Redis

Operations at BMM require that a redis server is running on xf06bm-ioc2. For whatever reason, the redis server never starts correctly after a reboot.

This will become apparent when bsui and cadashboard fail to start, complaining about Connection refused with xf06bm-ioc2:6379. 6379 is the port that redis uses for communication.

To fix this, ssh to xf06bm-ioc2 as yourself (not the user account) and do this command:

dzdo systemctl restart redis

F.3. Xspress3

To re-power the Xspress3 and its associated server:

1. Verify that the power button on the back of the Xspress3 unit is switched on. It should be glowing red.

2. Press the front power button.

3. Once running, reboot xf06bm-xspress3

Note

In the near future, the Xspress3 IOC will be moving away from xf06bm-xspress3, which is an old, vendor-supplied CentOS 7 machine.

F.4. Other IOCs

The startup acceptance tests in the bsui profile may eventually fail when trying to connect to instruments. For example, this:

TimeoutError: XF:06BM-ES:{LINKAM}:MODEL could not connect within 10.0-second timeout.

indicates that the Linkam controller is powered off and/or the linkam3 IOC is not running. After verifying power to the instrument, ssh to xf06bm-ioc2 and do:

dzdo manage-iocs restart linkam3

To get a list of all IOCs and their status, do:

manage-iocs status

Find the name of the relevant IOC and restart it using the manage-iocs rastart command.

It sometimes helps to know what port number each IOC is communicating on:

dzdo manage-iocs report

Here is a list of all the IOCs and what they do:

IOC name	purpose
cam01	Prosilica camera #1 (DM1)
cam02	Prosilica camera #1 (DM2)
cam03	Prosilica camera #3 (DM3)
cam04	??
cam07	??
cas-switch	enables cahnnel access security management
dante	Dante controller for Ge detector
diode	DIODE controller (filters, spinner stage)
EigerTest1	??
F460	FMBO current monitor (not in use)
flag1	Front end flag (not in use)
I400	FMBO electrometer (not in use)
lakeshore331	LakeShore temperature controller (Displex)
linkam3	Linkam controller
logitechF710	Game controllers
MC01	Collimating mirror
MC02	Monochromator
MC03	Slits2
MC04	Focusing mirror
MC05	Harmonic rejection mirror and DM1 filters
MC06	DM3 diagnostics and slits3
MC07	xafs_8 motors
MC08	xafs_8 motors
MC11	goniometer motors
MC12	goniometer motors
MC13	goniometer motors
mythen1k	Mythen (in use??)
omega_i_series	??
onewire	1Wire temerature sensors near mono
piE625-M2	M2 piezo controller
piE625-M3	M3 piezo controller
piE625-mono	mono piezo controller
plc1	PLC IOC
pscdrv	??
quadEM-1	QuadEM box 1
quadEM-2	QuadEm box 2
recsyncIOC	??
simDetector	??
va-1	Vacuum controllers and gauges
xf06bmAlarmIOC	Alarm server

F.5. Motor controllers

F.5.1. FMBO MCS8

Save/restore will not correctly remember motor positions on any opf the FMBO-supplied axes (i.e. everything except the XAFS and XRD end stations).

Restore power to the motor controllers. It should not necessary to restart the IOCs (MC02 through MC06), but do so if motors are not moving after powering up the controllers.

The steps below are the commands in bsui for homing sets of axes. The ks.cycle() steps are not, strictly speaking, necessary. But it is a good idea to be sure the amplifiers are in a good state. If any amplifier faults trigger upon starting the homing process, the motors will be left in a confused state.

ks.cycle('slits2')
RE(recover_slits2())

ks.cycle('dm3')
RE(recover_slits3())
RE(recover_diagnostics())

ks.cycle('m2')
RE(recover_m2())

ks.cycle('m3')
RE(recover_m3())

ks.cycle('dcm')
RE(dcm.recover())

After homing, the monochromator should be at 7134.3 eV, which is an energy within photon delivery mode E. The mirrors and dm3_bct should be at positions consistent with mode E.

Some of these take quite a while to go through their homing procedure. The diagnostics recovery takes almost an hour because a couple of the motors are very slow and have a long way to go to hit their limit switches.

The M2 bender does not have a homing routine. To verify its position, move it by hand to its negative limit:

RE(mvrbender(-10000))

That command is a wrapper around killing the amplifier, then moving by the specified amount. Feel free to take larger steps.

Once it hits the negative limit, reset its offset

reset_offset(m2_bender, 0)

then move it back to position and kill the amplifier:

RE(mvbender(BMMuser.bender_xas))
m2_bender.kill()

For reference, the XAS position for the bender is around 212,000. The XRD position is around 107,000.

Note

Never home M1, the collimating mirror. It is close enough to the right position and should never be moved. In fact, there is no reason to power up the motor controller.

The fear is that an axis might fail far from the correct position.

The M1 motor controller is in rack MC7-RG-E4 on the mezzanine. It is near the bottom and is the only one with FMBO branding.

F.5.2. Homing MSC8s via PEWIN

If homing from the bsui command line fails, your best bet is to find the laptop with PEWIN and connect to the motor controller with a USB cable.

First, go to xf06bm-ioc2 and stop the reelvant IOC.

Fire up PEWIN. In the PEWIN command console, issue this command: M1x16=1, where x is a number from 1 to 8 and indicates the axis that you want to home.

You can home multiple axes simultaneously by issuing M1x16=1 instruction while other axes are in the process of homing. PEWIN is happy to multitask.

Note that any axes that involve coordinated motion – mirror vertical, mirror horizontal, slit vertical or horizontal – work such that all coordinated axes are triggered for homing when any individual axis is triggered. For example, to home the M3 vertical axes, you do not need to do M1116=1, M1216=1, and M1316=1. When you issue any one of those three instructions, all three axes will begin moving.

F.5.3. geobrick

Few or none of the motors on the NSLS-II standard geobricks are equipped with home or limit switches. This includes the motor controllers in racks RGC-1 and RGC-2.

Save/restore should remember positions.

The IOCs for the xafs_* controllers (MC07 and MC08) did not need to be restarted, however all the goniometer controllers (MC11, MC12, MC13) did.