Allen-Bradley 2705 RediPANEL Push Button Module
The Allen-Bradley 2705 RediPANEL Push Button Module combines the functions of standard push buttons and indicator lamps, an Allen Bradley Chassis with binary input, and binary output modules, and a 1771-ASB Remote I/O Adapter Module. The RediPANEL provides 16 discrete binary inputs in the form of push buttons, and 16 discrete binary outputs in the form of indicator lamps behind the buttons. Like the 1771-ASB Remote I/O Adapter Module, the RediPANEL acts as a slave in an Allen Bradley subnet in an EPICS control system. The RediPANELs are linked via subnet connection to other RediPANELs and Remote I/O Adapters, and back to a VMEbus I/O scanner. They correspond to the ADAPTER number when configuring an Allen-Bradley subnet. An Allen-Bradley / EPICS subnet allows for up to 8 adapters to be located on one Allen-Bradley subnet link.
RediPANEL Push Button Module Configuration
Refer to figure 14.1 for the following instructions.
Setting the Module Switches
SW1 is the Address Switch Assembly for the RediPANEL modules. Switches 1 - 6 select the Universal I/O Chassis adapter number. Observe figure 14.2 for the proper address settings, when the switches are closed (ON) this corresponds to a binary 0 in the adapter address, and when the switches are open (OFF) this corresponds to a binary 1 in the adapter address. Note that switches 1 - 3 must always remain in their closed (ON) positions as the EPICS control system only uses adapter addresses 0 - 7.
Switches 7 and 8 should remain in the closed (ON) position as this will place the Remote I/O adapter in the 1st I/O group number 0, used in the EPICS control system.
SW2 sets the baud rate and other configurations. Switch number 1 should be closed (ON), this sets the baud rate at 57.6K baud and allows for a link distance of 10,000ft over shielded, twisted pair cable. Switches 2 and 3 respectively control the the ability to make the lamp indicators appear steady or flashing, see section 14.5.1 for more information on this. Switch number 2 should be open (OFF) to disable the steady lamp setting, and closed (ON) to enable the steady lamp setting. Switch number 3 should be open (OFF) to disable the flashing lamp setting , and closed (ON) to enable the flashing lamp setting. Switch number 4 is for the push buttons, it should be set open (OFF) to disable the push buttons, and closed (ON) to enable the push buttons. Switch number 5 controls the switch fault action. If the switch is set closed (ON), all push button operations will cease when a fault is detected using the Push-To-Test button, communication will halt, and the FAULT LED will illuminate. If the switch is set open (OFF), faulted contacts will be forced to the released state, all other switches will operate normally.
Switch number 6 should be open (OFF) as it is not used. Switch 7 should be open (OFF) to disable the handshake bit. Switch 8 controls the last state function. This switch should be closed (ON) to enable the last state function. In this mode, when communication is lost and the COMM LED is off, any output signals that were on will remain in the same state once communication is restored. If switch 8 is set open (OFF), the module will turn off any output signals that were on when communication was lost. A summary of switch positions is available in figure 14.3.
RediPANEL Push Button Module Installation
The RediPANEL is wired via a three pin terminal block to a standard three wire AC power cord. The three pin terminal block plugs into the back of the rediPANEl and accepts 90 - 264 V AC ranging from 47 - 63 Hz. When all of the lamps are activated the internal DC power supply provides a maximum of 360 mA of current. If all of the lamps are de-activated, the current draw on the internal DC supply is 190mA.
In order to protect the RediPANEL against heat, soot, moisture and other forms of contamination, an enclosure is required. When choosing an enclosure for the RediPANEL, it is advised to follow the standards developed by the National Electrical Manufacturers Association (NEMA). Refer to NEMA Standard # 250, "Enclosures for Electrical Equipment" to find a suitable enclosure.
Each RediPANEL comes with two mounting brackets and a cut-out template to simplify installation. The panels can be mounted either horizontally or vertically. Mounting multiple panels horizontally requires at least one inch of spacing around the mounting flange, vertical spacing should be at least 6 inches between cut-outs. In both cases, the depth of the enclosure should be at least 8 inches.
RediPANEL Push Button Module Wiring Connection
figure 14.4 details the wiring connections to the RediPANEL mating connector. After the wires are inserted into the connector as detailed in figure 14.4, the connector can be plugged into the receptacle located near the lower right hand corner of the back of the RediPANEL. The AC power must also be connected as mentioned in 14.3.1.
RediPANEL Push Button Module Module Use
Mapping to EPICS
Mapping the the buttons to an EPICS control system is quite sim ple. There are 16 buttons, and 16 lamp indicators, divided into 4 "cards". The first 8 buttons are represented as CARD 0, binary inputs SIGNALS 0 - 7, and the second 8 buttons are represented as CARD 1, binary inputs SIGNALS 0 - 7. Likewise, for steady lamp operation, the first 8 lamp indicators are represented as CARD 0, binary outputs SIGNALS 0 - 7, and the second 8 lamp indicators are represented as CARD 1, binary outputs SIGNALS 0 - 7. For flashing lamp operation, the first 8 buttons are still represented as CARD 0, binary inputs SIGNALS 0 - 7, and the second 8 buttons are represented as CARD 1, binary inputs SIGNALS 0 - 7. However, the first 8 lamp indicators are represented as CARD 2, binary outputs SIGNALS 0 - 7, and the second 8 lamp indicators are represented as CARD 3, binary outputs SIGNALS 0 - 7. A map of the RediPANEL buttons, and indicators is shown in figure 14.5. Keep in mind that the for steady lamp operation, both the button and the lamp indicator associated with a location on the RediPANEL share the same CARD and SIGNAL address, however, the button is discerned as a binary input, and the lamp indicator is discerned as a binary output.
It may also be helpful to note that the EPICS binary input records for the push buttons may be set to I/O Interrupt Scan. The record will be scanned on a change of state of the push buttons as opposed to a "time" scan where one is forced to scan at a fast rate in order to "catch" the pressing of a button.
In the upper right hand corner of the RediPANEL there is a green COMM LED indicator, and a red FAULT LED indicator. The possible combinations of indicator actions are listed in figure 14.6 .
LED and Lamp Test
To test the indicator lamps and the LED indicators press the white round button labeled TEST on the bottom of the panel. When a test cycle is executed, all of the indicator lamps and LEDs will first go on for one second, then go off for two seconds, then return to the state they were in before the TEST button was pressed.