2-12 B90 LOW IMPEDANCE BUS DIFFERENTIAL SYSTEM – INSTRUCTION MANUALORDER CODES CHAPTER 2: PRODUCT DESCRIPTION22.3.1 Replacement modulesReplacement modules can be ordered separately. When ordering a replacement CPU module or front panel, provide theserial number of your existing unit.Not all replacement modules apply to the B90 relay. The modules specified in the order codes for the B90 are available asreplacement modules for the B90.The order codes shown here are subject to change without notice. See the web page for the product for the latest options.Table 2-5: UR order codes for replacement modules, horizontal unitsUR - ** - *POWER SUPPLYredundant supply only available in horizontalunits and must be same type as main supply| SH A | 125 / 300 V AC/DC| SL H | 24 to 48 V (DC only)CPU | T | RS485 with 3 100Base-FX Ethernet, multimode, SFP with LC| U | RS485 with 1 100Base-TX Ethernet, SFP RJ-45 + 2 100Base-FX Ethernet, multimode, SFP with LC| V | RS485 with 3 100Base-TX Ethernet, SFP with RJ-45FRONT PANEL + INTERFACE | 3C | Horizontal front panel with keypad and English display| 3D | Horizontal front panel with keypad and French display| 3R | Horizontal front panel with keypad and Russian display| 3A | Horizontal front panel with keypad and Chinese display| 3P | Horizontal front panel with keypad, user-programmable pushbuttons, and English display| 3G | Horizontal front panel with keypad, user-programmable pushbuttons, and French display| 3S | Horizontal front panel with keypad, user-programmable pushbuttons, and Russian display| 3B | Horizontal front panel with keypad, user-programmable pushbuttons, and Chinese display| 3K | Enhanced front panel with English display| 3M | Enhanced front panel with French display| 3Q | Enhanced front panel with Russian display| 3U | Enhanced front panel with Chinese display| 3L | Enhanced front panel with English display and user-programmable pushbuttons| 3N | Enhanced front panel with French display and user-programmable pushbuttons| 3T | Enhanced front panel with Russian display and user-programmable pushbuttons| 3V | Enhanced front panel with Chinese display and user-programmable pushbuttons| 3W | Enhanced front panel with Turkish display| 3Y | Enhanced front panel with Turkish display and user-programmable pushbuttons| 3I | Enhanced front panel with German display| 3J | Enhanced front panel with German display and user-programmable pushbuttons| 3E | 7" Graphical front panel display in multiple languages with USB front port and user-programmable pushbuttonsCONTACT INPUTS AND OUTPUTS | 4A | 4 Solid-State (no monitoring) MOSFET outputs| 4B | 4 Solid-State (voltage with optional current) MOSFET outputs| 4C | 4 Solid-State (current with optional voltage) MOSFET outputs| 4D | 16 Contact inputs with Auto-Burnishing| 4L | 14 Form-A (no monitoring) Latching outputs| 67 | 8 Form-A (no monitoring) outputs| 6A | 2 Form-A (voltage with optional current) and 2 Form-C outputs, 8 contact inputs| 6B | 2 Form-A (voltage with optional current) and 4 Form-C outputs, 4 contact inputs| 6C | 8 Form-C outputs| 6D | 16 Contact inputs| 6E | 4 Form-C outputs, 8 contact inputs| 6F | 8 Fast Form-C outputs| 6G | 4 Form-A (voltage with optional current) outputs, 8 contact inputs| 6H | 6 Form-A (voltage with optional current) outputs, 4 contact inputs| 6K | 4 Form-C and 4 Fast Form-C outputs| 6L | 2 Form-A (current with optional voltage) and 2 Form-C outputs, 8 contact inputs| 6M | 2 Form-A (current with optional voltage) and 4 Form-C outputs, 4 contact inputs| 6N | 4 Form-A (current with optional voltage) outputs, 8 contact inputs| 6P | 6 Form-A (current with optional voltage) outputs, 4 contact inputs| 6R | 2 Form-A (no monitoring) and 2 Form-C outputs, 8 contact inputs| 6S | 2 Form-A (no monitoring) and 4 Form-C outputs, 4 contact inputs| 6T | 4 Form-A (no monitoring) outputs, 8 contact inputs| 6U | 6 Form-A (no monitoring) outputs, 4 contact inputs| 6V | 2 Form-A outputs, 1 Form-C output, 2 Form-A (no monitoring) latching outputs, 8 contact inputsCT/VT MODULES | 8L | Standard 4CT/4VT with enhanced diagnostics(not available for the C30) | 8N | Standard 8CT with enhanced diagnostics| 8V | Standard 8VT with enhanced diagnostics (only one module supported)INTER-RELAY COMMUNICATIONS | 2A | C37.94SM, 1300 nm single-mode, ELED, 1 channel single-mode| 2B | C37.94SM, 1300 nm single-mode, ELED, 2 channel single-mode| 2E | Bi-phase, single channel| 2F | Bi-phase, dual channel| 2G | IEEE C37.94, 820 nm, 128 kbps, multimode, LED, 1 Channel| 2H | IEEE C37.94, 820 nm, 128 kbps, multimode, LED, 2 Channels| 2I | Channel 1 - IEEE C37.94, multimode, 64/128 kbps; Channel 2 - 1300 nm, single-mode, Laser| 2J | Channel 1 - IEEE C37.94, multimode, 64/128 kbps; Channel 2 - 1550 nm, single-mode, Laser