Allen Bradley PLC

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Programming notes:

RSLogix 500 programming software issues:

• Won't connect, gives "No response from processor at selected path/node" error.

Due to the fact that we use a USB-serial converter, the PC can arbitrarily assign the wrong comm port number to the adapter. To verify communications;

1. ) Right-click "My Computer", and from pop-up menu, select "Properties".
2. ) A "System" window will appear. On the left, click "Device Manager".
3. ) Scroll down and click on "Ports (COM & LPT)". That entry will expand, and you will see "USB Serial Port", followed by a comm port number such as "COM1", "COM6, etc; Take note of that number and then close the window.
4. ) Open RSLinx Classic. Click the middle of the three square buttons, which looks like a little cable; a "Configure Drivers" window will open.
5. ) On the right, click the "Configure" button; A "Configure RS-232 DF1 Devices" window will open.
6. ) Look for a drop-down list titled "Comm Port:"; this should show the same number that you saw in step 3, above. If it does not, simply click on the little down-arrow to change it.
7. ) Click the "Auto-Configure" button. The PC will now test all possible serial communication settings until it finds the right ones. If it does NOT, you may need to power the PLC and/or the PC off and on.
8. ) Minimize RSLinx Classic, and re-open RSLogix. You should now be able to connect.

Micrologix 1000 Notes

Replacement Relays:
Omron

Micrologix 1200 Notes

Replacement Relays:
Original is Takamisawa (Fujitsu) NY24W-L, but not available from our suppliers. An acceptable substitute is Omron G6M-1A-DC24 (Allied stock# 70175686), with the caveat that contact current rating is reduced to 3A (as opposed to 5A with the Takamisawa unit.

SLC 500 Notes

Differences between SLC 5 series PLCs:

SLC 5/01
Processors let you configure modular controllers of up to 960 I/O and a 1K- or 4K-instruction memory capacity.

SLC 5/02
Processors let you configure modular controllers of up to 4096 inputs plus 4096 outputs nominally and a 4K-instruction memory. By installing an optional scanner module into one of the 30 I/O module slots, you can add ControlNet I/O, DeviceNet I/O, or Universal Remote I/O to the system. They offer 19 additional instructions, including a message instruction for initiating peer-to peer communication.

SLC 5/03
Processors let you configure modular controllers of up to 4096 inputs plus 4096 outputs and a memory of 8K, 16K, or 32K words. In addition to the features of the SLC 5/02, they have a second built-in communication port-an RS-232-C port that can be configured for ASCII or DF1 protocol, and can be configured for connection to a 1761-NET-AIC converter to provide access to a DH-485 network. SLC 5/03 processors provide bit-instruction execution times of 0.44ms and an overall system throughput of up to 10 times faster than competitive processors. Additional capabilities include: floating-point math, online programming and run-time editing, flash memory upgrades, built-in key-switch, and a built-in real-time clock and calendar.

SLC 5/04 and 5/05
Processors let you configure modular controllers of up to 4096 inputs plus 4096 outputs and a memory of 16 K, 32K, or 64K words. They have all the features of the SLC 5/03 processors, plus a faster communication port and shorter execution times (bit-instruction execution times of 0.37ms). Instead of a DH-485 port, the SLC 5/04 has a built-in DH+ port for communication with other SLC 5/04 and PLC processors, operator interfaces, and programming terminals. Communication via the DH+ network is three times faster than DH-485 communication. SLC 5/05 processors provide a 10/100BASE-T, 10 or 100 Mbps Ethernet port.

Replacement SLC500 battery
Dantona COMP-109 "B9650T" (Allied Stock #: 70157717)

Arc Suppression

• AC snubbers:
  

Allied Electronics pn# 70184748 - ([Littlefuse] Varistor, Circuit Protection; 175VAC; 455V; 4500A; Metal Oxide; 700pF; Radial; 85degC).

• DC snubbers:
  

Allied Electronics pn# 70015970 - ([HVCA] 1N4004 DIODE; 1 A (MAX.) @ 25C IF; 1.1 V (MAX.) @ 25C; 5 UADC (MAX.) @ 25C IR).

Procedure for clearing fatal errors in Allen Bradley PLC. (With RSLogix 5000)

1) Open RSLogix 5000
2) Connect USB A/B cable to CPU and laptop.
3) Click (top menu) "Communications/Who Active".
4) A Comm window will open. (Notice, on the right, that there are grayed-out buttons; “Go Online, Upload”, Download”.)
5) Look for the section labelled “AB_VBP-1, 1789-A17/A Virtual Chassis” (Oddly enough, it will NOT be under the “USB” section.)
6) See that most of the entries have a red “X” over them. One will not. Look for an entry that contains the words “…1769-L30ERM, Logix5330ERM…”Click that entry, and if it’s the right one, the “Go Online” button will be highlighted. Click that.
7) An Adobe Flash warning window may pop up. If so, ignore it and click it away.
8) Now a window should open, “Connected to Go Online”.
9) Click “Select File”.
10) Another window will open - enter a NEW filename, just anything simple you can remember to delete later, like your initials or “deleteme”, etc., (no spaces, no hyphens). This is because RSLogix is about to pull the program from the CPU and wants to save it to a file in the laptop, (with whatever name you give it). BE CAREFUL, do NOT select one of the existing files you will see, because doing so will overwrite it forever.
11) System will prompt “Create File and Upload?” - Click “Yes”.
12) System will upload program from CPU into laptop.
13) Once program has loaded onto laptop screen, look in upper-left corner.
14) If there is a fault, you will see a little red symbol with the word “Faulted” by it. Click the red icon and select, “Clear Faults”.
15) Now the icon will turn blue, and say “Rem Prog” (Remote Program). Click the blue icon and select, “Run Mode”.
16) System will ask if you really want to enter Run Mode - Click “Yes”.
17) The icon should now be green and say “Run”.
18) Click (top menu) “File/Close”.
19) Exit RSLogix and unplug USB cable.

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